Yep, I had a pair last year. Not quite as light as Dura Ace, but not that I'd be able to tell.
Usual Shimano quality, these as Mike said are Ultegra level quality.
Normal cup & cone ball bearing hub bearings, so easy to service.
They look the dogs doo daa's. Nice quiet freehub, which as you know Mavic don't have.
I sold mine, not because I didn't like them, but I found the front very susceptible to getting caught by cross winds, being a light rider (70kgs) and no upper body strength, I didn't like the loss of control?
Plus I couldn't ride fast enough to get them to their sweet spot, so the aero effect was wasted on me, but that would be the same for any deep section wheel & most people don't ride fast enough to justify deep section wheels.
I'd much rather have lightweight wheels which accelerate quickly, especially up hills. Being light means I can get away with lightweight wheels.
I'm looking at getting either some Fulcrum 3's, which have a 30mm rear rim depth & a 24mm front rim, which weigh about 1500grms
http://www.chainreactioncycles.com/f...w&gclsrc=aw.ds
Or these
http://www.cycledivision.co.uk/produ...er-pid133.html
Both get good reviews and are around the same price point.