I've read a few reviews about the M&P pistols, but haven't really read anything on the M&P .45. It seems like another plastic fantastic has made it onto the market. When the XD45 came out, many were saying how great of a pistol it was, so I had to buy one myself. I ended up selling it (which I regret.) I was looking at the M&P .45 on gunbroker, but have yet to handle one myself. What does the M&P have that the XD doesn't?