i recently bought a Pentax 645, i had been looking at them years ago, but read a few bad reviews, and heard the the 645N/NII were the ones to get, but they were more than i wanted to spend.
well i bought one anyway, maybe paid AU$250ish with a 75mm 2.8.
anyways, i love it.
buttons aren't an issue, the viewfinder is bright enough.

my dilemma now is, do i want another lens! 45mm or 150mm...