My personal bike is a -06 FE450 with 380 kit.
I have also removed all unessesary parts (starter, starterclutch, battery, lights, cables, sidestand and so on..)
The bike feels very light and is easy to ride, I'm more in control on this bike than the 450. It's also not as tiering on the 3 hour races.
It's faster and has more torque than a 250f.