I purchased this gone about a month ago and I have to tell you its amazing! The ROF is very nice. I personally like the XL better than the other one because you have more rail space. The ergonomic pistol grip is a great plus. Also the blow back is a great thing to add on. The FPS is more around 340-355. The 450 round Hi-Cap magazine is great to. I also use the King Arms 360 round Hi-Cap P-Mag and the JG 300 round Hi-Cap magazine. It takes all M4/M16 style magazines(to my knowledge).
Ergonomic Pistol Grip
Stock Wobbles(easily fixed)
Shows some wear on the rails after a few games(just need to purchase some rail guards)
Rating: [4 of 5 Stars!]