I like Wico's for games that you don't want to feel the corners (Robotron, Time Pilot, etc...).
I like T-stiks for the ones that you DO want to feel the corners on (Crazy Climber, etc...).
I really don't like the Happs sticks because of their long throw and "twanginess".
As mentioned above, when you release them from one direction quickly, they will go back and forth several times between that direction, and the opposite one.