I'm no expert. I've ridden 400, 450 (owned this one), 525 and 530 KTM exc's. They are all very good (duh). Last fall I bought a 2010 FX450 Berg. The Berg just takes it up a notch. The Berg's oil change is easier and it holds a little extra oil. The stator puts out some extra watts. The motor is smoother than any exc I've ridden. The fuel injection has been perfect on the Berg. Much of the rest is either the same or very similar. The handling is a bit different - the Berg steers quicker/easier and the exc's are more stable IMHO. Adding extra fuel tanks is an expensive pain on the Berg. Right now the 70* Bergs are an undervalued bargain.