Combine butt variation overlain with seat variation, we're going to soon need a software program to sort out the possibilities??!! I bought a corbin saddle last year, received it in May. It was extremely comfortable straight from the box and couldn't detect the breakin period Corbin mentioned. I have somewhere around 7K miles on it now and haven't had any tailbone 'issues'. Maybe I'm brain dead or simply butt dead? The stock saddle wasn't kind to me.