I ride with a predator and he has never had any problems with his. He has the basic mods, Slip-on , Civic Intake w/K&N and no lid, and rejetted and I have a full exhaust, Pro-tec lid, Pro-Design UNI and a PC lll. In a drag the 700 wins pretty easy and I would give the 700 the nod by a good margin in jumping and trail riding also. I have no idea about MX because have never had mine on a track.
The predator is a good quad and was in the list of 3, I narrowed my choices down to before getting my 700. In the end the seat was uncomfortable to me and my buddy having one kinda took it out of the running. I went with the 700 and am very glad I did.