I have a set on my Enduro. They did have early problems, 'tis true, but since I have had mine pimped by Spesh (Under warranty), I've been very impressed;
Plus points;
Massively stiff in terms of steering
As above in terms of braking
Light. Surprisingly so
Superb at holding a line
Adjustable easily for climbing. The wind down is very easy to use
Good adjustment for all round use (Rebound etc)
On the negative;
Slight steering angle reduction. However, you'd need to be on really tight stuff before you notice!
Reliant on a 25mm hub.
Not the best at really small bumps (Less of an issue if you're a little larger!)
Erm. That's about it, really!
Overall, as long as it has been serviced and pimped by the SpeshSpannerMonkeys, they're really very good!