Here are my thoughts:
Note: Mine is the 9mm glock mag version
1. Its a bit on the light side, but it is reasonably sturdy for a tactical tupperware carbine.
2. Surprisingly accurate to the point where using it at standard pistol ranges (10-20") is almost cheating, but works well out to 50 yards.
3. Will handle practically every type of ammo you feed it, ranging from 115 grain roundnose projectiles to 148 grain hollowpoints, and feeds without fail every time.
4. Folds up into a nice compact package, and has a built-in lock, so you can store it and transport it no problem.
5. Sights are not the best, but they work.
In short, it is a fun little gun, great for backpacking, uses standard pistol mags and lightweight.