I just upgraded my old Glock 19 to the new frame in OD green. I'm keeping the original frame to add an Advantage Arms .22 kit on to it to make it a dedicated .22 plinker. I had the choice when I went into civillian law enforcement between the Glock 21 and the SW .45, and I went with the SW only because I couldn't quickly draw the Glock without juggling it due to the girth of the grip. I've shot them extensively (other folks guns) and have no problems as they tend to be damn accurate. Robar shaves the frames down very nicely, I had my Glock 22 done and it was sweet. If I was going to buy a .45 however, I'd lean towards the GAP.