This is an extremely well built, powerful gun. i got it for Christmas, and i do not foresee having to replace it any time soon. It is very upgradeable, and the included battery is not horrible.
A few warnings....
1. the battery is hard to get in due to the fuse box.
2. I purchased AIM rails, and they work wonderfully;however, there is a ring UNDER the delta ring that needs to come off, but cant due to the fusebox. this is a minor problem though.
1. strong. mine shot 420 out of the box.
4. extremely upgradeable.
1. bad battery placement.
2. some rails hard to get on and off.
Rating: [5 of 5 Stars!]