I have one on the Furai. Compared to the SMGTe's padded cushion and wider seat, it is a fair amount more slippery. Being plastic, it doesn't actually stay wet at all, but (depending on seat angle and design) you may have to drill a hole in the bottom of the seat to avoid the seat filling up with water (it runs straight through the padding).
Challenge like to ziptie the ventisit on at shoulder height and crotch. The lack of support in the middle means it can shunt around a little when you're moving. As the surface offers very little friction against lycra, it can all get a bit 'configurable' on the road.
Takes a bit of getting used to if you put it on a new bike, especially if switching from a big steely brute to a lightweight twitcher at the same time.
There endeth my $0.02.