I've had a 20 ga. Y-gun for about 2 1/2 years; it has a lot of pros, and a few cons. It's a very light gun, 5.4 lbs, which I really like for hunting. It's chambered for 3" ammo, but I can't see myself shooting magnum ammo though it; I imagine it'd kick the crap out of me! I have shot some 1 oz. 2 3/4" loads through it, and that wasn't bad. I'll do it again this winter pheasant hunting. It also came with some REALLY nice wood - here are a few pics of the stock. Pretty nice for a gun that cost $526 out-the-door!
Best of all, I shoot it really well. It's a light, great handling and good shooting gun.
The cons, you ask? Well, about a year and a half ago I started having a problem - light hammer strikes which resulted in FTF's. I sent the gun to Briley for warranty repair at the worst possible time, when they were in the middle of their FFL problems. They had it 16 weeks, and sent it back with new hammer springs. The gun has not FTF'd since it was returned.
Some more "need to know" info: Only the 20 ga comes with ejectors; the 12 and .410's come with extractors-only. They don't currently offer a 28 ga gun, at least in the U.S. If they did offer one, at the price of the 20 and with ejectors, I'd own one.
Some more bad news: they only come with 1 trigger and with a pistol-grip stock.
If you can live with the cons, it's a pretty nice gun.