da Rock and airborneSGT:

"Hard" as in full rudder deflection from level flight causes a relatively fast nose down move ( I'll have to try this inverted next time too), as if I had pushed the nose down purposely at full deflection.

My Ultimates pull toward the belly too ( and they also roll a bit ), but I can easily compensate with a little up elevator and aileron.

The Skybolt surprised me as I cannot hold a knife edge on it at all.... and I have no problem doing so with most planes even when they have a high dihedral such as my Spacewalker II.