I have a Competition Pro and it's a good stick for some games but I find it has the following issues as well:
It has a very short throw for such a tall joystick
I find it awkward if I need to use both buttons as they're on opposite sides
Since it requires a stock 5200 stick be connected as well, you need to make sure the 5200 stick is centered before using the Comp Pro. If the stick is leaning in any direction, the character will movie in that direction, even if the Comp Pro isn't being moved. Since it doesn't have any sort of calibration built-in, you may need to fiddle with the centering the 5200 stick a bit before the Comp Pro centering is 'just right'.
I find it hard to hit the diagonals with this stick. It's almost impossible to use with games like Popeye or Gyruss.