I've got the same gun and it works reasonably well as long as I keep it dripping wet with oil. The primers like to flow a good bit and when the lube wears off it starts catching casings inside the cavernous receiver. I think this has to do with how the original firearm is designed for open bolt operation and the bolt weight/recoil spring assembly is too light for reliable closed bolt functioning. Keep in mind they mill away the sear catch at the rear of the bolt and a clearance cut on top of the bolt further lightening the bolt assembly.
After about 500 rounds, the gun got more reliable as far as not ejecting casings inside the receiver shell. Accuracy isn't bad if you use a longer sling and apply tension between the sling and the firearm. The FCG looks somewhat fragile, but has held up so far. The primer flow still worries me a little, but most of what I run is low power reloads. Only time will tell.
The $49 7.62x25mm kits with 3 magazines are an excellent source of extra mags since 9mm feeds perfectly through them. Keep the mags and toss the rest of the parts on eBay and the mags essentially become free!
For $299 it's a good conversation piece if nothing else.