There is a growing legion of 1911 shooters that for some reason or another seem to be attracted to the M&P series, and the thumb safety on the larger models has a somewhat familiar location and feel to them. Personally I am not a fan of adding a manual safety to a pistol wasn't originally designed to have one. Furthermore, with a nod toward all those 1911 shooters, I never found the safety on an M&P to feel like the one on old Slab Sides. On the other hand, some shooters far better than me recommend the M&P 9 with a thumb safety as a good 1911 transition pistol. I won't argue - I just trained with pistols that had no manual safety for too long. In regard to removing the thumb safety from an M&P, I know it can be done, but its sometimes better just to wait for one that wasn't so equipped to come along - my opinion anyway.