My Jitsie is.... Ok.
It's never slipped a rotation, hasn't broken in getting on for a year, loud, positive etc.
BUT
It does make 'skipping' noises a lot which are disconcerting at best. I think Adam said this is due to the extra strong springs flicking the pawls in and when it doesn't quite engage properly makes a noise... Or something along those lines. It's made these noises since new.
If it didn't make these odd noises it would be great. To be fair I haven't cleaned it out, and ride in sea-front conditions a lot.