I've got one. They've been around for a while under various names: Bingham, Puma, and now Mitchell. AFAIK they're all made by Pietta of Italy.
El Guero's experiences pretty much mirror my own, other than his issues loading the magazine, which I find pretty easy once you get in a rhythm with the loading tool. The gun is pretty well-made, decently accurate, and tons of fun to shoot, but it can be a little fussy and mine was a jam-o-matic at first. The magazine fit very loosely in the well and I had lots of failure to feed issues. I sent it in, they replaced the magazine (they may have done other things), and now it runs pretty well. Not perfect, but acceptable.
The manual specifies HV (1300FPS+) ammo, and I was also advised to use only copper. When I was arranging to send it in, their guy specifically recommended Federal bulk or Winchester Super X.
Breaking it down is a little more work than I'd like. First, take the stock off, then undo the two screws holding the trigger group on and remove it. Next, unscrew the cap at the back of the receiver (a quarter works well, and remember to hold some pressure on it because it is spring-loaded). Take the cap and the short spring out, followed by the guide rod piece and recoil springs. One of the springs has a keeper on the end that locks the charging handle in place. With this removed, the charging handle can be pulled out and the bolt will now slide out the back of the receiver.
Overall, it's a great plinker that you can have a lot of fun with, but as a 'serious' or do-all .22, you're probably better off with one of the more conventional choices.