MGI Hydra?

Was in my LGS the other day, and saw they had a stripped lower for one of these with the 9mm and 45 acp magwells. It's a multi caliber capable rifle based on the AR platform, also known as the MARCK 15. Looks like you can also configure it to fire 5.56, 7.62x39, 458 SOCOM, and a couple others.

Anyone have any experience with these things? I've tried to search for reviews, but haven't found much luck besides a couple superficial reviews. If I bought one I'd be selling/replacing 3 or 4 guns with this one, so I want to be sure it's worth it.

My buddy has one of the MGI lowers with the AK magwell, it works really good with his Bushmaster 7.62x39 upper using MGI 7.62x 39 modified bolt carrier and enhanced bolt. Another thing I like is it uses standard AK Mags instead of the FUBAR AR15 7.62x39 style mags.

Sweet, just what I wanted to hear! I have a Yugo AK, but it's just not really for me, so I was hoping on replacing it with one of these!