So I've put at least 1000 rounds through mine, did a bit of a thread in hunting and sporting shotguns. Basically quite happy with it, runs great. Had one problem with it, the internal buffer weight has sort of an internal plunger which is spring loaded and held in place by a threaded end cap. That end cap came loose and the threads got messed up, stopped cycling properly and made the loose parts sound. TNA sent a replacement buffer and once I got it I loctited the end cap in place which I would recommend as preventative maintenance.
Overall I love the gun and TNA has provided great service and I would 100% recommend.
Some early discussion there were many Turkish shotgun naysayers but I've seen some crappy turk shotguns and this isn't one of them.