I own this gun. Main point is it's cheap, nice basis to mod, but at the same time you can put your heart and soul into it. There are multiple very helpful modifications you can do without buying upgrades. Its also quite easy to disassemble. Many people don't take it seriously, as it is made by Echo 1, but bobghengeskahn has completely defied those assumptions. As fuzzywolly said, you should check out the other articles on this rifle, such as the one in the gallery, and hop up topic.
Regarding stock performance, I was fairly accurate at a human target from around 160 feet. Despite reviews and advertisements, mine chronoed at 430 fps with .20g and 385 fps with .25g. The hop up is slightly difficult to adjust, but gives me a nice straight shot after working with it. The only thing I dont like, that bob does like, is the VERY heavy trigger pull. All in all I love it and continue to find ways of increasing performance without spending too much money, and it has the potential to be a great rifle. However the key is to work on it, I wouldn't go to an OP with it stock.