Basically this gets a thumbs-up from me. I had terrible monkey butt (think tennis elbow, but for scooterists/motorcyclists) but this has cured me.
I know it’s expensive, I know it’s hard to justify before you get it, but believe me it’s worth it. Don’t just take my word for it.
It does come with a 2 year warranty. For my People 150 a large pillion (passenger) size fit me, 11 x 14, although I wonder if the small pillion might have worked also.