Yes - bought one at the NEC bike show. I'd been looking to buy the Sena SMH10 but as I have an evoline helmet I was persuaded into the Sharktooth. I then had to go out and buy an evoline helmet that had the cut-out(s) for the unit - doh - so it ended up much more expensive. That said, in the new Sharktooth compatible helmet it takes up virtually no space either in or on the helmet.
Now have it connected up to radio (on an RT1200), Zumo 550 and phone and so far (I haven't done too much with it yet) it seems very good. Volume is great - keep having to turn it down - and it seems to do what it says on the tin.
One word of caution - if you want to do bike-bike with bluetooth, you both need the same system, whether it's Scala Rider G4, Sena or Shark. The units won't talk to other units (have just found this out with a friend who has spent a lot on the G4).
I'm a big Shark fan and this unit seems to do the biz.