I bought the small cruiser AirHawk at Daytona Bike week, and they offered it at J&P cycles with a 120 day return.
It's great, and I use it on my Street Glide which has a solo Mustang seat on it, my Fatbob which has a Corbin solo on it, my Concours with the stock seat, & my KLR with the stock seat.
I haven't been on a all day rain with it, so I can't give an opinion in that area, but I roll it up and stick it in my saddlebag, when I need too.
Having more than one bike makes it economical, compared to getting aftermarket seats for all of them. I had the Mustang & Corbin before I bought the AirHawk.