I'm a little surprised that your wife dislikes the Ultimate passenger seat. It is larger and more comfort focused than the OEM and most passenger options.
Won't really know till we go on a longer ride.
It's been mentioned a sheep skin (I have one), and Air Hawk (I have one), so until we both go for a longer ride, we won't really know. I know hard doesn't mean uncomfortable, so in the end, I expect all will be well.
At least I can bring my OEM IS seat with me in my trailer on a long trip.