Sure, but how long it is has everything to do with what you want for. Straight line accel, the longer the better. If you still want to corner and are just trying to limit wheelies, something shorter is in order. I was advised to buy no longer than a +4 for MX. The +3 seems to work great. A good balance between nimble and stable.
If you are tearing up the dunes, I hear +6 is cool. Drag racing, +12? The only prob with the $200 ones, IMO, is weight. They are made out of steel, whereas some of the more trick ones are aluminum. (although at +3 it didn't seem heavier than stock)