On the flip side, I've put 2000 or so rounds through mine, which I picked up used with unknown mileage a year and a half ago, and had zero issues. I like the grip angle more than Glock's, and the disassembly is similarly simple as Glock's. No complaints from me, but I've never dealt with the service dept.
Take a look at Questar's issues with Glock and their business practices with the Canadian market. For my next handgun, if Glock was in the running, that would be a deal breaker. If I were to go polymer all over again, I'd take a hard look at the M&P.