I have tried the stock Ultra/Road Glide seat, the stock CVO Road Glide Ultra seat, H-D Sundowner, H-D Hammock, H-D Road Zeppelin, and Russell Day Long (RDL). The RDL is by-far my favorite, but more importantly, it makes the ride most comfortable for my wife who has had major back surgery.
Here are a few of my learnings:
1. I've used the same seat on three different touring bikes - a 2009 Ultra Classic, a 2014 Ultra Limited, and a 2015 CVO Road Glide Ultra. I consider the RDL an investment, not an expense.
2. Nobody sees the seat when you're riding and you'll be able to ride longer than anyone else in your group, so ignore the fugly comments.
3. Buy an OEM seat on Craigslist or Ebay for the carcass shell (buy a ripped seat super cheap). Save your old seat so that you can return your bike to OEM when ready to sell and transfer the RDL to your next bike (assuming the fitment allows)
4. If you can do the ride-in program, DO IT!!! I had to send mine back twice for tweaking, both times my error in measurements and/or seating position specification. The shipping back and forth gets expensive quick due to the size of the box!
5. Don't get the support spring unless you are +280#. I was on pace to expand up to their 250# threshold for the support spring and so I opted for it the first time around. I had them delete it the first time it went back.
6. Get the heated seat!
7. We found the tourpak backrest on the Rushmore bikes leaned back too far, so I bought a used/ripped backrest and had them rebuild the backrest to have the passenger sit more upright.
8. I prefer the all-leather material, but opting for the pleather material (same as OEM) can save you $$.
Now, the big question...would I do it again? Probably not before test driving a Corbin or Mustang (at a rally) just because of the expense. That said, I've certainly gotten my money's worth out of this one.