My first gun, an XD9 service, is going on three trouble free years. I've found since then that I can shoot the 1911 platform much better. I still love the XD though and I have been considering trading it in on an XD tactical. I don't know if the longer sight radius will make me more accurate or not. I personally don't see what you get with the M that justifies the cost, although if I had the money to throw around I'd get one of the new competition models.
"Well boys, I reckon this is it. Nucleyoor combat, toe to toe with the Ruskies." - Major "King" Kong