I've got a buddy in Pheonix that uses it...he loves it. However, he tells me that it hits his CPU pretty hard. It might not play well with other VST plugs.
Yeah I think this would be better in the computer/software forum.
I've just used it briefly, and I've been very happy with it so far. However, I didn't buy it alone. It came along with the Mackie Tracktion Ultimate Bundle that I bought for $79, so I think I've thoroughly gotten my money's worth.
I haven't really delved into it, and I have no idea how much it costs on its own, but all the samples I've checked out have been very pleasant so far.