I've been considering branching out from the 1911 to the M&P9 or the P30... I gave the M&P9 a shot at the local range, and it had the weirdest recoil feeling. Felt like someone was slapping my palm with a PVC pipe. Glocks didn't do this, H&Ks didn't, but both M&P9 (fs and 9L) did. Just really, really sharp.
Could this be due to worn out springs? My hands are small and they only had the medium backstrap, could it have been that? I couldn't get the best purchase with my smaller hands.