I never found the grip on the M&P's to be sticky. But as far as longevity of rubber grips, I have had Hogue rubber grips on my pistols for years with no change besides the rubber texture beads getting worn down from use, sort of like the sole of a shoe would with use. I have never experienced them softening, getting oily, or absorb oil and puff up like you described. I have Hogue grips on my Sig 232, Beretta M9A1, Ruger 22/45, and a Hogue Overmold stock and forend on my Mossberg 500 and no problems with any of them.