The groove rider clip on the bottom of the shaft flew out on all three of my Comp Pro USBs.. Easy fix, squeeze the clip with pliers and reinsert, but it doesn't really raise the stick's points when you can suddenly pull out the stick while playing.
The manufacturing quality isn't up to par in many other ways either. Two out of three of my sticks had one of the firebutton microswitches misaligned so that you couldn't make contact by pressing the button. Had to realign those manually.
The overall feel isn't as sturdy as the real thing.. It's as if the plastic is thinner or something.