I've got one on my GSA. It's a bit difficult to comment on, cause I haven't tried the standard GSA seat. Managed 3hrs 20mins yesterday without getting out of the saddle (apart from over a sharp hillcrest, but that's a adifferent story). Seems to tip you forwards slightly in the seat. Madam has had a pillion seat extension fitted, but she says the seat itself is better than the pillion seat on my previous GS. It looks the bo11ocks as well.