It just shipped. No one I know has 1 yet, but it uses the weaker 134a gas only right now. Green gas is too powerful for this gun right now. So expect lower fps then an average AEG, and even lower fps due to it shooting the heavier 8mm bb.
Keep in mind the FPS results he talked about are just guesses since he doesn't own a chronograph and the ambient temp where he lives is so cold (Gas powered guns FPS are dramatically different depending on temp) and the fact this uses the 8mm bb which is heavier and hard to compare in relation to a 6mm bb.