I have used both a CH Fighterstick and a Saitek X36. Both of those sticks have considerably weaker springs than the Cougar, although neither can hold a candle to it in terms of quality or programmability (in my opinion). I really do like the Cougar, but the spring tension limits my ability to make quick, accurate, short throws with the stick. I thought I had adapted to the increased spring strength, but I was wrong.
In any case, it was almost worth the money just to experiment with programming the thing!