just picked some up yesterday from bestbuy. i really like the concept but the were a little to "exaggerated" for me. i would really like just a bit of "trigger lip" on the R2, L2 buttons. this adds about 1/2 of lip. but i think i'm a rare case cause i hold my controller a bit unorthodox. with my right hand i put my index finger on R1 and my middle finger on the bottom edge of the R2 button, but with my left hand a just use my index finger to use both buttons. so these real trigger things push my fingers to close together on my right hand. so right now i just use one on the L2, lol.
so if you hold your controller like a normal person, i think these are fantastic. but if you hold it with two fingers up top then it's a little cramped.