I heard about the fusion so i went to try it out, i picked one up at the local shop and i was hooked on it right then, i dry fired it then i bought it. Next day I shot it, this marker has wicked accuracy, speed, weight, and everything else you can think of! I can say this, I wont be getting a new marker for a long time. I have also heard the fusion is as good as any $1000 marker out there, and i belive it.
If you have $500 and looking for a new marker, get the fusion!