I am. I've only test-recorded with it, but I've played it out three times now (into a SS guitar amp and P/A amp) and am very happy with it. Amp, cab, and effects models couldn't be better (in my experience), and ease of use is pretty darn good for having so many options.
Downsides: a) it needs a foot controller to be really effective live (available option) and b) you can't use re-amping and some other features with any software but ProTools, which is very difficult to get configured properly (but I finally did).
If you're not high-tech-averse, I highly recommend it. Price is sure right for what you get.