I had one for a couple of years, and while behringer's reputation is generally well deserved, the FCA202 was actually an acceptable product for what it is, and it's price
only cons really are unbalanced inputs and no mic pres (but it's designed to work in-tandem with a small desk mixer, like I've been doing for years)
can't really comment on performance in OS X, other than it uses built-in CA drivers, as I was using a PC at the time