They do pull hard out of the hole but everyone will tell you that once you reach 70 MPH in the race, you will pass him with out turning back. I have also heard that if you put good transfer rods in, you can keep with them at the start.
2003 F-7's are fast as hell. The 2004' still work good. They had to put some more weight into it to make the frame stronger. The 2005 have a stronger frame however they have the new diamond drive which saves weight. These sleds haul. However around here we call them Fire Crackers. No explanation needed.
Arctic Cat insists this is not the case, but I have heard that before too. The Diamond Drive seems like a good idea, but I'm not completely sold on it yet.