My experience with 9mm 1911s has been excellent. Of my 1911/2011 pistols from STI I have several in 9mm (Edge, Guardian, Escort and VIP) and haven't had any issues. The only caliber that had a hiccup was my .40 caliber Tactical, but STI promptly took care of it. In fact I just last week ordered a Trojan and an Eagle from Dawson in 9mm for IDPA.
“Once you have had a wonderful dog, a life without one, is a life diminished.” - Dean Koontz
STI Eagle (2), STI Trojan (2), STI Edge, STI Guardian, STI Sentinel, STI VIP, STI Ranger, STI Tactical 4.0, STI Rogue, STI Escort, 1943 Remington Rand 1911A1