First off, this is an outstanding gun, at least externally. When I picked it up, I was surprised at how light it was, as I was expecting the rail to cause the gun to be fairly front heavy, but when I picked it up, it was fairly well balanced. The metal body is excellent, with the DD trademarks engraved into the side. The rail system is 12" long, giving you plenty of space to mount your hardware. The crane stock is easy to open and holds me 9.6v 1600mAh battery. The spring is apparently fairly hefty, as my battery was unable to pull it back, but then again, my battery was almost entirely dead. Another benefit is that this gun hold all my different brand magazines with room to spare, so Pmags, STANAGs, all of those fit with room to spare. Some are kinda wobbly, but you can fix that with a little tape.
Another thing to mention, this gun comes with the SOPMOD Block II rail system, so you can save yourself some money if you get this system.
As soon as I can, I will post my review of the VFC OEM gearbox that this gun comes with.
12" Rail system
Thin pistol grip
Fits all my magazines
Noveske Firepig/hog/whatever it is
Cheap-feeling magazine, the paint is already chipping off.
Bolt catch isn't the best, mine is already broken (~10 uses)
FPS too high for some/most fields (~450)
Aside from its flaws, this thing gets 5/5 for externals
Rating: [5 of 5 Stars!]