Sold my RC-51 after a year of racing and street riding to get the Duc. Ive had it for 2 1/2 years and think I'll keep it a lot longer. Im sure you'll miss the power of the 900rr, but the bike is great for riding the mountain, going to trackdays, and sucks riding around town. Buy a new seat or get it recovered with more padding. I think honda uses cardboard and covers it for their seats, so you might be use to it already. The maintance checks arent fun for your wallet, but its good to know your bike is running like it should. Buy a case of beer and make friends with your parts guy. So you get some good deals, because parts are not cheap. Good luck on your purchase.