Hello.
I have had around 13 lessons from John Barnett and can't fault his tuition. He's taken me from a total novice to potentially knocking on the door of an A class shooter in a very short space of time. (I'll know more of where I stand class-wise once I start shooting at registered shoots. I'm basing that on my average from shooting Mickley's 'Competition Targets'.)
I have a Caesar Guerini Summit Impact, which I bought through Mickley. I tried a range of guns with them and John suggested I try Scott's competition gun - his CG Summit Impact. I'm a biggish lad and the hefty, high-ribbed 32" Impact suited me down to the ground. John's advice and Scott's kind gesture of letting me use his gun was invaluable to ensure I chose the right fit for me first time, so once I decided that was the gun I wanted they got me one in, second hand, which I promptly bought just before Christmas.
I'd recommend Mickley all day long for tuition. It's a nice friendly, relaxed atmosphere there too. Other grounds I've been to don't feel quite so welcoming to a beginner.