I also have the sundowner. Bought it this spring. I went from being able to ride about 150 miles before a sore ***, too now I can ride all day and don't want to get off the bike. It is very comfortible. I recommend it highly.
have had 3 diff seats on my bike while trying to find one with long butt time for both me and my +2... finally found it in the wide mustang- i can ride as long as my fuel can last. my +2 is prob pretty close- she does start getting restless after about an hour or so...
and i like the look: