I just purchased an Ultimate about a month ago and it has solved my seat problems. I can now ride all day and have no issues what so ever. I also had an Ultimate on my Valkyrie and it was perfect for me. That being said I also had a Corbin on a bike years ago and it was nice. My riding buddy has a Corbin on his NC700 and he can go all day with it. We too are amazed how rock hard the Corbin is but it works for him. Tough call, but I would choose the Ultimate.

I would add that I think the Ultimate looks better too.