While I am new to the sport, this weapon immediately impressed. I got it early June 2012 and have yet to have a single problem with it. I was worried at first at the polymer build would not hold up, but I have so far been proven wrong. I play in southeast Louisiana, in what can only be called a jungle, and it has taken quite a few bumps and falls, including about a fifteen foot drop out of a tree (the sling failed; my fault, not the mounts). Not even a scratch.
It is accurate and fires fast. Using the stock battery has worked fine, and I have enough velocity to make it through some heavy foliage using .25s. There's a little rust on the carry handle but that's more to do with the improper care I have given it. Sloppy, I know, but the barrel gets cleaned every two weeks, regardless of play.
Speaking of play, my squad and I mostly play small skirmish and objective games in the heat of summer, and lack a reliable indoor arena. This weapon sees more than a fair share of harsh conditions. All manner of mud and gradue.
Light but durable.
Reliable (only weapon in a group's total of fifteen to not have any sort of mechanical problems)
Fire selector is fairly loose; will virtually glide off of semi with a slight touch. Please note that I am left handed and this could play a factor.
Delta ring is somewhat difficult to get off; not necessarily bad as you would not want it flapping in the breeze.
Gearbox is somewhat loud, enough to mask the sound of a WE SCAR GBB from roughly twenty feet or so.
Nunchuck battery is iffy in the crane stock if kept collapsed. I am fortunately large and tall enough to require it to be fully extended to use comfortably, though it might cause issues for a player of smaller stature.
The slide cover for the hop up can catch sometimes. A little dexterity may be required.