I like them.
Have had a few. including a couple carbines. Still have one.
If you keep the gas system reasonably clean, they function well.
When you go to clean it, there's a bit of a trick needed to get the stock off. If you don't do it right, you'll damage the stock.
.
..not to mention bending those control arms...
Lots of folks that own centerfire semi-auto rifles expect to shoot them forever without cleaning the gas system. When I worked in the Browning Arms gunsmithing shop I can't tell you how many BAR's were sent in for repair when the only problem was a dirty gas system. Some were so dirty that the gas piston was frozen solid, requiring the use of a slide hammer to disassemble. Fortunately the end of the piston had an internal thread facilitating the use of the slide hammer.
Yep - ran into a couple of those here too... At the same time, the BAR is probably the best semi-auto out there...