I have the TI2 Desktop, I want to say that I recommend it, but I'll be honest - it's flaky as hell when it comes to using it via their VST/USB hookup. I suspect it's a great bit of gear when you're using it outside of their VST hookup (so as a classic bit of hardware with audio out to a mixer or something) but generally I find I dislike the majority of integration flaws it has.
In terms of sound, if you're after a really thick supersaw, great.. if you're after very clear/crisp sounds and really wide sounds, it's great. But yeah, for me, that's where it ends... the implementation is a nightmare.