I had one. Killer, killer amp. Not sure what you want to know. I made a few posts about them.
To me it reminded me of the Old Uber mixed with a refined Mesa like the JP2C.
Had a very deep low end but the mids sat just right. He has a ton of mod options that can really change the sound up with a few switches. Extremely well built.
The bad, the Footswitch is rather large (I had the Beta) and the quoted time was tripled. Not to say it took too long but he told me 6 weeks and it took 3 months. Michael is a super nice guy and while I dislike the made to order type of program and while I wont ever be in the market for something like this again, I would buy from him again without fear of being ripped off.
The other thing is the Beta is 180w. Its a monster and you need to turn it up loud to get the most out of it. I would not mind trying the Gamma at all. I've heard some great clips and the price on that is a lot less.
For pricing of a new amp, depending on the current exchange rate I can't see much beating out the MI amps. Maybe Ceriatone or something.
They aren't like some holy grail end all be all or anything but they are excellent amps.