I recently purchased the Ultimate mid rider seat with both backrests and am so impressed with it. It arrived on the morning I was due to set off on a trip and it fitted quick and easy and has no interference with the pannier openers. It was comfortable from the first moment and is a lot more supportive than the stock. Yesterday I rode over 1020 kilometres to get back home for work and my butt or back were not sore at all. I would highly recommend this seat to anyone considering swapping over the stock. The F6B is the ultimate bike, I have fitted the helibars as well and now I can just ride and ride. I love this bike, love it.