I've had this watch/foot pod combo for 9 months now and have logged over a thousand miles in that time, so I've come to know this system's ups and downs pretty well by now. I'm happy to report it's mostly ups.

In terms of design, the watch (aka "running computer") is exactly what I've been looking for. It's taken Polar a long time to design a watch I truly like, but they've finally done it. What I like most is that its options are almost completely customizable. During exercise, you can set five different screens with three different lines of output (eg, heart rate, pace, total distance, total time, lap time, calories, etc), which is fantastic. In fact, because I can customize each of the five screens, I find that I can put all the relevant info I need on just two and then toggle back and forth between them while I'm running. You can even set the heart-touch function to change screens for you if you wish (whereby, you bring the watch close to the chest strap and it triggers one of three functions - lap conclusion, back light, or screen view).

Aside from output, the watch also has a host of other great features, including fully customizable workout routines (eg, free, basic, interval, and user-created). What I've done is create "Easy", "Long" and "Fast" routines, each with a different heart rate range so that I can easily monitor my effort without having to think.

The watch also has a "sleep" mode, where you can turn off the watch when not in use to conserve battery power, as well as other key features like a fitness test (which measures your resting heart rate (RHR) and VO2max) and even an event countdown calendar. I now know at any moment how many days I have before the San Francisco Marathon (my first). It's a true motivator and really nice touch. Polar really did think of everything with this watch in terms of design. Perfect.

The foot pod is also well-designed. Physically, it's very sturdy and feels like a smooth round rock you might find at the bottom of a stream. It's actually larger and seemingly heavier than I expected it to be, which concerned me at first, but after attaching it to my shoe, I literally could not tell it was there. As a result, it's the best of both worlds: rock-solid sturdy but unnoticeable while running. Another great feature is that the foot pod will automatically turn off after a certain period of inactivity, again conserving battery power. Great.

Not much to say on the chest strap, except that it's infinitely more comfortable than the previous design and seems to work well (I haven't had the problem of having to clean the contacts before every use as one reviewer mentioned; I merely wet it before starting, and then lightly wash it in warm water when finished).

If design were the only issue, this watch/pod combo would earn six stars from me. However, there are a couple of minor concerns of which one should be aware:

1) It took me a LONG time to calibrate the foot pod. Initially, I did as the manual suggested and ran around a track at a medium pace for 1200 meters (three laps). At that time, the calibration read 1.093, meaning that I was covering 1,093 meters for every 1,000 meters the foot pod was detecting. This is quite a margin of error, especially because Polar stated the foot pod should be 97% accurate right out of the box (implying that any calibration should end up somewhere between 0.970 and 1.030). This clearly was not the case for me. Worse still, the resulting mileages were way off when I actually ran known distances. Thinking hills could affect the calibration, I proceeded to recalibrate on a variety of courses and at varying distances (up to as much as 10K/6.1M). Every time, I got a different reading, ranging from 1.004 to 1.027. Finally, through triangulation and a bit of interpolation, I arrived at a manual calibration of 1.010, and it now seems to be accurate within +/- 2 meters per kilometer. Still not perfect, but certainly closer to the 99% that Polar claims you can achieve with individual calibration.

So, what's the moral of the story? If you only need/want approximations of your running distances, the foot pod is great right out of the box. However, if you're competing and need/want more accuracy and precision, expect to make a concerted effort. Incidentally, I recommend calibrating on courses that most reflect what you normally run and at as long of a distance as you can stand while maintaining good form. Doing so should help improve the accuracy. Also acknowledge the fact that changing shoes and/or courses (eg, from asphalt to grass) will affect the mileage output, thus resulting in the need to recalibrate. Fear not, however, because you'll eventually become more efficient at knowing how to find your best calibration.

2) Another niggle is that the watch freezes up or blanks out from time to time (half dozen times over the past 9 months). This is especially annoying during an important training session because you not only lose that day's data, but also because you have to stop what you're doing to reset it. Unfortunately, you cannot simply remove and replace the power source like you can on other electronic devices (eg, pulling the plug on a computer and then replugging it in to reboot); you have to do a "global reset", which involves pushing all four buttons side buttons simultaneously (not an easy trick for the less dextrous among us). In any event, I have since learned to do a preemptive global reset if I have a race or an important training session ahead of me that day, especially if I haven't had an "episode" in many weeks. The good news is, you don't lose any of the data stored previously thank goodness, just that day's.

3) One final (small) annoyance is with the footpod. It doesn't have a (sufficient?) low battery indicator, so you never know when you'll have to replace it's 2 AAA batteries. If it dies mid-run, you're out of luck. Like with the watch freezing, I change batteries if they've been in more than 20 hours of use and I have a big run ahead of me that day.

In sum, I think this is a fantastically-designed watch with a couple of functionality issues, but none enough to dissuade me from buying it. I absolutely love it and wonder what I did for so long without it. Way to go, Polar! 4 stars

I got the watch as a gift in December. I use it 3 to 4 times a week and run approx. 15 miles a week. I have used it in very cold outdoor weather, rain, and in the hot summer with no problems. I use the heartrate monitor when I'm swimming laps in the pool. Free website is excellent. Transfer all your runs to the website and see progress on graphs. Very accurate footpod and heart rate monitor. Watch also looks good on your wrist(not big and bulky). 5 stars

I upgraded from a beginner's model to the RS200sd and am glad that I did. I love the ability to track my pace and distance while running. The countdown event alarm allowed me to stay focused for a marathon while I trained. The only drawback of the design is that the watch and the wrist band are molded together. My guess is that if the band breaks you have to buy a new model. I've had it for a year now and the wristband is still in good condition. I gave it four stars for the wristband. If the wristband were replaceable I would have given this review five stars. 4 stars

I haven't used all the features yet, such as the foot POD, but it has been very dependable so far. I found that I don't have to bother wetting the electrodes prior to my workout. It seems to pick up a signal just fine. I really like the "heart rate target zone lock" feature so I don't have to constantly watch my heart rate. It simple beeps at me when I'm above or below my target. The coded transmitter works with the "Polar ready" equipment in the gym. The calorie counter is far more accurate than any cardio machines. 5 stars

For those interested in getting a basic HRM this is a really good tool. The features are easy to use, and the possibility to use the online tool from Polar gives you a way to do a nice and structured training diary. The calorie counter seems far more accurate than those you see in fitness centers etc.
Only complaint I have is that I cannot get the weblink to work and have to update my data manually on the website, but that is no real trouble. I also noticed that the HRM band is fairly small, so for a big person it might be tight.
One of the buttons have fallen off, but seems to be more because it got stuck and not because of a design error as such.
For my next HRM I will also select polar!! 4 stars