Yep....for a good few years now.
Positives......
Comfy, to the point she goes to sleep on a longer ride very easily
More space for BOTH of us to move about on bike (very positive, as I'm 6 foot 4 and neither of us are 'petite'
Nothing else on the market that does the job but allows me to keep the ADV seat that I really like for solo off-road
Negatives
As waterproof as a bit of Kleenex.
Not only soaks up water, but HOLDS it in its sponge, so even after a month of no rain, sit on it and it pisses out water all down the Missus' arse
Ridiculously, extortionately expensive for what it is
Makes fitting a top box a pain in the arse...you have to make up plates and move the box so far back you'll pull wheelies in 5th two up, and even then the grab rail becomes useless.
The replacement grab bar looks crap.
I'm glad I've got it, but would I buy one again? FUCK NO.
I'd borrow one*, make a template from the base, cut a bit of foam, a gel pad and a bit of PVC/faux leather covering from a marine chandler's and make one up for a fraction of the cost, and doesn't soak up water like a frigging tampon.
HTH
*EDIT
It's a simple pad of foam, badly sealed, on a rigid base.......all you'd need to do is get a pair of scissors, some cardboard and a pencil and cut some crescent shapes with a slightly squared inside curve out of it.....line it up on bike after removing OEM grab rail and make a shape to fit out of 3/4 inch ply or some thick rigid yet softish plastic or something.
Glue some foam on, several layers, using a proper glue for foam, whack on a mouse mat or gel pad on top, make it all a good 25% bigger than it needs to be, then trim it down with some decent scissors.....then either take that pad and base to a furniture restorer/seat specialist or just buy some suitable material, cut cover to size, sew if necessary, staple the cover down with a ten quid staple gun from....er..Staples

and fit it.