I have just received this today, and have to wait for the weekend to take it out into the field. So far the gun is very solidly built, with a few small drawbacks I have to throw in.
Overall, it seems nice, but I'm not jumping around in joy over every feature this gun has to offer.
-Really nice, solid rail system, with rail guards surprisingly included
-Very nice feeling retractable stock, handguard.
-Looks really nice
-My dust cover doesn't seem to click in consistently, and pops right back sometimes w/o even opening the bolt or anything.
-Unlike some previous G4 series, the bolt catch does not either work, or mine is broken.
-Battery change is very difficult (although it is perhaps a nice trade off for the storage position of the battery. One must know and drill themselves how to change batteries efficiently with a stock type like this, otherwise they'll spend over 2 minutes trying to figure it out.