I've been using this racquet for about just over a month now and I am very pleased with it's performance. It has a good weight / feel to it and I would recommend it as a above average starter racquet.
I began playing Racquetball full-time this year (recreationally with a co-worker), and my first racquet was a bottom-of-the-line / Wal-Mart one. It was Ektelon's Power Freak, which still played well. The O3 Silver was a significant upgrade and I can see myself using for quite some time. I may try a different model down the road, but this one will be in my bag at least as a backup once I move from recreational to competitive.
My only recommendation will be to change the standard grip that it comes with at some point. 4 stars