I have a B67 (identical to the B66 except for the way it attaches to the seatpost, as far as I know) which has been pretty comfortable so far, but it's only been two weeks. I'll write a review up and have a little more to say about it in another 2-3 weeks maybe.

Haven't done the proofide stuff on it yet either.

The only thing I had trouble with, and I'm not sure how to describe this, but at first it seemed very uncomfortable for um, certain parts... but that seems to be getting better.

It replaced an old "Lepper" brand seat from Holland, and the Brooks is much better, the other one was very very squeaky.