I bought a UX2 for my nephew last month for his birthday and have played around with it a bit. It's a nice unit. It doesn't have as low a latency as my PCI sound card, but it gets the job done for most audio recording situations. And it works great as a practice headphone amp too! lol...
The vst's are a nice bonus and sound pretty good. I have a Line6 Bass PODxt Live with all those models built into it and the vst's do a pretty good job at them, comparitively speaking. I've been thinking about picking up the Full Bass Line6 VST package to use myself.
