I've seriously toyed with getting one before, they make fantastic reef fish. I've suggested them to people with smaller tanks before but they aren't always easy to find so I thought I'd share the link when I came across it.
The reason these are so hard to find is because there is only 4 species in this genus.....There is usually a reason fish are hard to find, and that is because they are already in low numbers out in the natural habitat...hence, rare to see them for sale...