i bought this mag a while back, and i really like it. the motor is kind of loud but hey, it holds 2500 rnds. so if stealth is what you are after this probably isnt a good choice. overall its pretty solid, but there are no instructions that come with it. take off the left side (if looking at the back) to put the batteries in. the plastic is kind of thin so be careful. i have one of these and one for a M4, and both work great.
you dont have to wind (fast!!)
great for a support gunner
thin plastic (feels like a drop would break it)
no instructions (read above for battery installation)
really long cord(only a con casue mine is a G36C so there is a lot of extra cord)
batteries are a pain to get in
Rating: [4 of 5 Stars!]