Bought 6 boxes to save on shipping. After using up most of it there is my review.
These shuttlecocks lack major qualities that one would expect from the brand name:
Durability - some break after just a few shots.
Consistency - shuttlecocks from the same box could have different speed.
Flight pattern - some are spinning and wobbling in the flight while new.
Bottom line - you can get MUCH better quality shuttlecocks of training grade than these tournament ones. I know I can.
2 stars

I found the shuttle if smashed a couple times the feather is destroyed
it has no durability ..... 2 stars

I never received the item. Address shipped to was incorrect. Shipper did not re-ship item or refund cost. 1 star

just like the first review, this shuttleocks does not last long. It breaks after few shots. But consider you only pay $12.50 for a dozen 1 star