I asked the same question a month or two ago... and pretty much got the same answers: UTOPIA
Glad I took the experts advice (wished I would have asked for opinions before I bought a kury backrest and then had to spend $$ on the Utopia.)
As for me and my SO we love the utopia. I even ran the intercom plug through the seat support hole so she doesn't have to try to connect at the side, she just plugs in right in front of her.
Looks like I'm pretty much odd man out....I installed a Kury backrest and it was too high on my back - right between my shoulder blades, pushed out my shoulders and was very uncomfortable.
Then I purchased a used seat with a Utopia already installed. With all the raves on this board I figured I was all set. However, I didn't care at all for the position it put me in. I adjusted it every which way but couldn't get comfy. Now it could be something with the seat it was installed in, or maybe with the backrest itself, don't know - but there is very little resistance when putting m feet up/out on the highway pegs and leaning back. Sort of like a reclining LazyBoy. Just not the position I want to be in when riding a MC.
Ended up making mods to the Kury to lower the pad (so that it now sits right on top of the seat) and I love it. I ride all day and never get tired.
I have the Utopia on my Wing and I like it, I'm very comfortable riding with it, but if I were buying a drivers backrest today I would buy the Wing Master that Chrome World sells. They both look great on the bike and they both install the same way on the bike, it's just the Wing Master attaches the bag that hangs on the back of the drivers backrest to the backrest so it won't flip around and fly up and hit your back in the wind when riding solo like the Utopia bag does. You can fix that problem easily with the Utopia yourself at your own expense, it's just with the Wing Master you don't have to and that's why I recommend the Wing Master.