Bought Aeron Chair from Griffin Office. OMG! Its like sitting on a cloud from mount Olympus. Best chair ever. I also had a tailbone pain, due to sitting too long on office chairs. Aeron Chair completely removed it. In terms of delivery, was super fast. Bought chair Lunchtime Monday, Wednesday 12pm was already sitting on the chair, was delivered to my door step. Thank you so much Griffin Solutions Team, you are all-stars! =)