i haven't tried a hot sync with os x for awhile
but i use my palm addy book all the time.
i just noticed that when i start palm desktop (2.6.x) i have a visor after all... that there is no longer this dumb as$ pop up message that used to happen all the time, saying "hot sync preferences are set up already"
it was annoying as all hell, hmm have to go try a sync when i get home.... i was just about to try the unsupported palm 4.0 with my visor too, now maybe i won't have to .....