First of all I hat rented guns at gun stores. They get abused by people who know nothing about guns and usually not cleaned or taken care of by the store. At least that is my observation and experience. I would never judge a gun by how it performed as a rental. That said, I own an M&P .45 with more than 5000 rounds down range with it. I have never had 1 problem. No slides releases when I put the mag in. Never a FTL or FTT. Nothing. It has performed flawlessly and at 25' it can shoot 2" groups all day long. So enjoy your Glock... you missed a great gun by using very limited data. Did you ever post up here to see what owners here thought of M&P's and what their experiences were or is the Gun Rental your only data point? I think Glock's are fine too. In fact I think Glock's and the M&P are very even and it comes down to personal choice. I chose the American made M&P from S&W over the European model and couldn't be happier.

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John 1:17
NRA Life Benefactor