My Colt 1991A1 9mmP does just fine. It feeds ball or ogival JHP (I load mostly bulk Remington 115 gr.) out of 9mm or .38 Super magazines (Metalform 9-shot .38 with round follower.) and is plenty accurate for IDPA (Or anything else but maybe NRA centerfire.)
I have read that the GM slide is too heavy for 9mm and that the action is sluggish. I can't tell any difference from the light loaded .38 Supers a lot of ESP-ers use.
Certainly 9mm ammo and brass are cheaper and more readily available. And there are more 1911 parts, accessories and gunsmiths than, say, BHP. But you have to find good ones. And a 1911 is liklier to need help than, say, a Glock.