We've owned one since the 80s, very controllable, well-handling, but the double stack to single feed mags tend to be problematic. They got a bad reputation among the marines for not functioning well when dirty, and the magazines contributed to that. However, they are one of the cheaper NFA full auto toys you can buy, prices hover around 4 to 5 thousand depending on condition and accessories.
Many of them became police or police guns following the war, ours came from an Illinois department. Now, not used for anything but recreational shooting with tuned magazines, ours runs reliably and is fun to shoot - it's got a low cyclic rate so you can be fairly precise with it. However, they have a reputation of breaking firing pins and strangely enough, the fins on the compensators are fragile, so they should be stocked up on, especially as those parts are getting harder to find.