Well, I took all three bikes to the Kuggmugga Trail ride in southern NY. Three loops, grass track too. Took the 400 on a 12 mile loop and the grass track.
Ride report-
The grass track was fun, threw a lot of mud in the corners. Handles well, suspension worked well.

12 mile loop was an experience. Bars too low, vibrate like crazy!! Pipe makes me bow-legged, need to slim it up.
The rear shock was fantastic, cushy and well controlled. The front forks hammered me- lots of sharp edged rocks.
The motor. I was worried about stalling it because it is a bitch to start cold. I kept it in gears 1-3 just off idle and it
never stalled. Tight to moderately open single track, lots of hills. It never let me down.
Mods to come. Flatten and raise the seat- too low for me. Higher bars, wider pegs, figure out how to minimize the vibes. A slimming diet is in order on the left side.
Unadilla in two weeks! Wonder if I can motocross the 400??