They look great, some of the best looking cymbals on the market.
The sound is quite distinctive. Open is a little bit trashy, good chic sound, clear stick definition. I agree with most others here in saying they're a fraction quieter than most. I'd say this is a benefit more than a drawback though as hi hats bleeding in to snare mics happens so often.
This will have application in most play-styles, but I'd imagine the washy sound would be inappropriate in some contexts.
My only criticism is that the hats don't sit totally flush, they sit slightly skewed and about 3mm of the bottom hat
is visible on one side. I thing any difference this makes to the sound is negligible.