Oh, I just don't trust it. It uses invisible daemons, leeches off CoreServices, basically acts like a DLL might in Windows. I haven't heard of too many problems with it, other than that in the past it ate up a good chunk of memory and "unexpectedly quit" off and on, that sort of thing. I'm just something of a purist and don't like things latching into my kernel. It's totally a personal opinion thing. Lots of people use it and swear by it, and that's cool with me.