I've had a couple of RDL seats with their backrest while it is fine comfort wise I prefer the Utopia backrest, comfort is the same, it is built lighter, much cheaper unit to purchase and if you decide you want to take the backrest off for some reason you don't have that notch ruining the look of the seat.
That seat/backrest is on my K1600. I did not order anything BMW specific, so I would assume it is Russell's standard pattern. They do offer different stitching patterns for the seat and I believe the stitching patterns can be ordered for the backrest as well. From other forums, I am under the impression that RDL can/will build or stitch anything you like. One of the guys on the BMW forum had them stitch the BMW -6- logo in his backrest.
I have the RDL with the RDL backrest on mine and I love it. I like how I can simply fold it forward to get a fat mans leg over the seat and if I so choose, I can easily just pull it out if I do not want it there.
I normally don't go for farkles that are only intended to improve the looks of my wing, but I indulged myself in this case, and I'm pretty satisfied with the result. It was pretty easy to install, and fairly reasonable cost wise ($29.95).
2018 Goldwing Tour Ultimate heated seat and passenger backrest
We just got our new Wing last month, did our first trip the other week and recognized the seat needed to be upgraded. I really wanted to wait for a heated option that integrated with the Wing controllers but am just too impatient...