I *usually* love Corbin seats, but not the one for the Busa. It should work great if you are tall, but I am only 5'7". The Corbin wants you to sit with your butt firmly planted on the back of the seat, If you're short, you end up on the front with your thighs taking all the weight and not well supported. Had to sell mine after a couple of rides with it. Hope yours works out well for you.
I'm a little worried about that. I'm 5'9" and usually rode the stock seat near the front. I guess I'll know for sure here in the next few days.
What are the next best options for shorter legs? (As if they haven't been discussed).
The Tobin is low and flat, but it's not on par, technically, with the touring seat designs. Sargent doesn't make a Hayabusa seat, but will build one on my pans... so will Rick Mayer, Russell, etc. The Sargent is the most affordable. I've never read a review on the Saddlemen options.