Got mine a few days ago and was able to get it out to the range. I'm really pleased with it. It consumed Winchester High Velocity without any problems at all and accuracy seems really good. I was shooting off-hand and getting 7 ring or better at 25 yards once I had it sighted in. I'm not the greatest shooter and I expect a better shooter would be nailing the 10 ring with this pretty consistently but I'm shooting better with this than I am with my High Standard!
I tried a few other types of ammo in it, Winchester Target (worked), Power Point (slide wouldn't lock back on empty), Velocitor (slide wouldn't lock back on empty), Blazer (slide wouldn't lock back on empty and had a couple stove pipes). I should note that the ammo the slide wasn't locking back on isn't recomended for the conversion. It was a bonus that Winchester Target worked but I'm going to stick with the High Velocity as thats what the manual recomends and I want a little bit more recoil for training purposes. For me this unit is meant for training with my 1911 not for bulleye shooting.
One note, I wasn't able to get to the range for a couple days so I was "forced" to lubricate it with the supplied oil and let it soak for a couple nights. I'm pretty sure that helped with the success because they ship dry.
By the way, mine is mounted on a Colt Special Combat Government and by the design of the STI conversion I don't see why it shouldn't function just as well on any standard frame 1911 because it is a self contained unit.
Cheers