Haven't tried out that one but did buy my wife a gel pad last week that sits on top of the better HD pillion. She seems to think it helps. We rode over a 1000 miles from Thursday to Sunday including two 300+ mile 7 -8 hr. rides. Gel pad is about the same, just under 100. I guess in hot weather, you can put it in the refrig or freezer for extra coolness. Wonder if your tongue would get stuck to it? BTW - you can't change your wife's behind. That's why they invented girlfriends isn't it?
I bought the butty buddy for the wife and she liked it. Spread the seat out a little more for her. That and the backrest made for a comfortable ride for her.