Seems pretty good to me, definitly lighter than the wheels that came with my bike. I've only had about 3-4 rides on them so far due to brake problems (unrelated to the wheels). I'll keep ya updated though.
I have some threads on these wheels as well as my brake problems you may experience if you have Hayes Hydros here in the MTBR Forums.
I think the name of the mag was Bike? (it's a uk mag larger format) they have a section about these wheels. I believe it's the current issue. Heard because of the construction of them they are stronger than other wheelsets.
Couple of issues to consider...
1. Finding the center locking rotors
2. Are they compatible with your current brakes?
3. Replacement parts will be hard to find as well as expensive.