Excellent, Money Well Spent, Very Happy!
I thought I would give these a go. To be honest I was not expecting very much, but I have been pleasantly surprised! The triggers just clip on and once on they stay on! I thought they might get knocked off as you play but they don't, yet if you want to take them off again it is very easy. I have two controllers and bought one set to try. I am so impressed with the triggers I am just about to order a second set. Once the triggers have been fitted your fingers no long slip off the L2-L1 buttons, plus they do actually make the buttons more responsive!
Considering the price and free postage if you have not got a set of these I would recommend you buying some now!