You will love it. Very comfortable and worth the money. For long trips, I have an adjustable back rest. I'm 5'8" w/ a 30" inseam and can get both feet flat on the ground on my 06 Ultra Classic.
I just put a Sundowner on my 08 FLHX, took me a few trips out to the garage to look at it before I got used to how much bigger the back end of the seat is. But after finally getting to put on over 100 miles in the saddle of my new seat and I am in love. Plus the old lady told me to tell you guys it 200 times better than the stock for her! I am 5'9" with 30" inseam and its just about the same as stock as far as height is concerned. Feels like I am pushed forward just a touch. Gonna have to adjust highway pegs a little to compensate, other than that it was the best $279 I spent! ( got it from Surdyke when they offered free shipping and I did not have to pay sales tax!)