I finally submit my raving fan review: I've had it for over a month, and I use it ALL the time. This rates a 10/10 because I just can't stop using it.
Hundreds of very good loops - better than most other sample CDs I've bought. The quality is is absolutely unparalleled - Spectrasonics does not mess around with fidelity.
There's the loops, whole and sliced ("groove control", which is actually more tha sliced - each bit sounds good on its own), as well as 3000+ very usable drum hit sounds.
The user interface is very easy to use. It is intuitive to manipulate the individual loop slices. It encourages experimentation and "playing" with the loop slices in a way that even Reason's Dr Rex can't quite manage.
If I had a complaint, it would be that loading the midi files for the "groove control" requires that you leave the application, but at least the directory structures are easy to navigate, and the loops and midifiles are well named - you really can't get confused. Ideally, there would be a "load loop" function inside of stylus, but I'll survive.
But basically, this is a fantastic value for the money. It sounds great, it has SCADs of sounds, a very good user interface. In the final analysis, I can't STOP using it, so I give it highest marks.
For Support and Docs, high marks now, because Spectrum is active on these boards, and they just released a very good PDF manual. Never a crash.