I bought a 9mm Commander kit and just got it to the point that I can fire it. Unfortunately I've not had a chance to get to the range, and it may be another week or two before I can.
I cycled some dummy rounds through it yesterday to see if those would work, and it looks like I need to tweak the extractor a little more, and I'm concerned the ejector may not be quite long enough. I won't know for sure on the ejector until I get some rounds through it, just a gut feeling right now. I'll post more once I get to the range.