Right, can only comment on the riders seat as our peg has'nt noticed them yet so has'nt tried it. (Have'nt told her I have bought them )
The foam/gel is quite firm so I was'nt expecting them to be that comfortable and it is wider as well which obviously affects the distance to the floor. In fact this made my inner thighs sore at the beginning but now don't notice this.
I have found the setup I like as it is adjustable like the bm one and after doing a some miles in the last couple of days I can certainly say it is more comfortable than the bmw and airhawk I have been using. No more moving around trying to get the best position and wearing cycling shorts under my troos!
The pillion seat has a small compartment for stashing stuff away and seems to rise at the front so I would assume no sliding forward.
They seem very well made and overall I am glad I got them. Each to their own though and others might not be impressed.