I like osirix on my mac. This viewing version ap has some user interface issues. The controls are not intuitive. Ive used a half dozen different imaging systems in my career and this ap has been the most difficult to master.
Mosy annoying problem is when scrolling through MRI slices the scroll feature can become locked and starts to rapidly cycle through series. Very touchy control bar makes it easy to accidently skip through slices.
That being said its handy for showing patients things in the exam room and the price is extremely reasonable for what you get.
SFRev about OsiriX HD