Things I liked: Ample space for a 9.6v battery, relatively solid feeling build with no wobble or flex, authentic sights including rifle grenade sights. Barrel length is absurd for a gun this size. It is just shy of the length of a full length M16's barrel thanks to the bullpup layout. Muzzle report is -very- dull for an AEG, making it harder to pinpoint if you're being selective with your shots.
Things I would have changed: The mag well takes a bit getting used to, I had to glue the trigger guard in place since mine came slightly bent, bipod has a little wobble and flex, it's mostly for show anyway. Gearbox isn't exactly standard, but there's plenty of guides online. Motor's pretty loud, but only to the person firing.
What others should know: Magazines are hard to come by and can be costly, but the weapon can be modified to fit modified M4 magazines with a bit of dremel work. Also be aware that the FPS measurements advertised are using .12g bbs which you should never use in this replica. With .20g rounds, it fires around 350-370fps, but don't let that deter you. With the barrel length it has, it makes this weapon highly accurate. Battery compartment is easier to close if you put the safety on before replacing the cover.