I've had two Russells. One I had built for my 1st '99 Concours after wasting $400+ on a Rich Mayer saddle that never fit me even after shipping it back to him twice. The Russell fit from day one and I was never uncomfortable on it. After I totaled that bike, I moved the saddle to my 2nd '99 Connie and ended up putting over 100K on it.
When I bought my NT, I was reasonably comfortable on the stock seat, but after my first long trip -- a little over 4K to Wisconsin and Michigan (where we managed to get 5 NTs together at the same time) and on around Lake Superior, I was ready for a Russell. I bought Elzilla's stock saddle after she had gotten a Russell built. I've got over 100,000 on this Russell now and did have to have it recovered once after I wore out the seam near the front of the saddle on the right side. That failure was a result of the way I have to hop and slide to get onto a bike due to my knee replacements. I've still never been uncomfortable on the Russell.
On my way to Spearfish in '12, I rode 1430 miles in 25 hours. I was shot, but my butt never bothered me at all. Then last May, I finally managed to complete a Bun Burner Gold, riding 1526 miles in 23 hours, 48 minutes. Like the Team Lyle people said about the Rachel Insanity Days Rally, it's "All the Nevada You Can Ride in 24 Hours." No buttockle discomfort whatsoever.
I don't think you can go wrong with a Russell, but I've never had a Rich's saddle. People who have them also speak highly of Sargeant's and Jim Moore has the Top Sellerie Deauville Saddle and likes it a lot.
The one saddle other than a Rick Mayer that I would absolutely not buy is a Corbin (but some people like them, too). The only Corbin I've ever tried was one I borrowed for a 200 mile day ride on my Connie. It weighed probably 25 pounds due to the heavy fiberglass seat pan that Corbin makes for all their saddles, it didn't fit the bike well, and it transmitted a huge amount of vibration into my "manly" region. I've never had that part of my anatomy go to sleep before or since!