I bought this product about 2 months ago, and it has seen quite a few battles.
It is an excellent stock gun, shoots about 380-400fps out of the box, one problem i have encountered with this product is the wiring is decent internally, but the fuse melted when my friend was pulling the trigger too fast, so i would recommend rewiring just the connecters for Deans.
I have an m140 Spring high torque gears and a tigh-bore, this thing is a certified bad-ass it shoots farther than most snipers and at better accuracy and velocity. although i would not recommend putting in an m140 spring if you don't have high torque gears and a good motor to go with it (it wont be able to pull the spring)
Good Fps out of box (spring will lose velocity over time)
Extremely good internals, some of the best i have seen stock.
Overall a very balanced platform to work with ( I set mine up as a DMR)
Hop up bucking and the barrel were not very good, was inaccurate until i replaced those both with better quality parts
Spring is not very strong on this gun.
I honestly cant think of anything else, this gun is a very good investment.
Rating: [4 of 5 Stars!]