I bought this on an impulse, partly because of suggestions from a friend about decent brand and almost entirely due to "hey look thats really wierd". Since it arrived I've used it for several games and let a friend use it too. We both agreed that it's a very solidly performing gun even with the included battery.
There are a few small issues with the design. First, the rails are a little skinny and may allow attached sights to wobble even when fully tightened. There is also a small screw on the bottom rail that pokes out just far enough so that you have to remove it to put a grip on (which doesn't wobble when tightened). You may also need to change the spring strength depending on where you play as it shoots at around 398-402 with .25g bbs out of the box. Other than that, mags can be an issue, but as long as you stay away from high caps it shouldn't be an issue. Honestly, nothing wrong with the design is detrimental to the performance of the gun (other than high caps).
higher top rails allows for the use of a full face mask
good hop up unit
great performance out of the box with included battery
awsome included iron sights
Small external design flaws (see above)
High caps are unreliable
Included mags only hold 46 rounds (I calls them liar caps)
Rating: [4 of 5 Stars!]