I have ridden on pretty much all of the seats out there. This is my thoughts on where the Saddlemen seats compairs.
1. Corbin Dual Tourer- I'm pretty sure all the Corbins are alike. A very stiff saddle. Like Posion said, it's like a horse riding saddle. It is stiff, but if it fits you right you will be pleased. I could not move to a diffrent position on it. It keep sliding me forward into the same position. It did not fit me right.
2. Mustang Seat- this is a good seat because it is very supportive. It sits your down in the seat with good lower back contact on the seat back. You are supported and held in place with this seat. If you have the riders back rest with, it all the better. The foam in this seat is firm, but not hard/ stiff like the Corbin. It gives more and allows you to move a bit and change positions alittle.
3. Saddlemen Explorer Seat- This seat sits you back in the seat, but not as much back support/ contact as the Mustang. It is a cushy supportive seat with a good amount of give because of the foam and Saddle gel. If you have the drivers backrest with it, it really adds a good deal to the comfort and support. It lacks a little thigh support compaired to the Mustang, however it is thinner at the tank than the Mustang for you vertially challanged riders.
4. The Ultimate Seat- I guess it's call "The Ultimate Seat" for a reason. Because in my opinion it probable is. It offers great lower back support, sits you back in the seat nicely. It has nice foam that gives, yet supports you with a good amount of firmness. I have not riden an Ultimate for a long time, but with the drivers backrest I can't see any problems occuring with getting uncomfortable. My only problem with the Ultimate seat is... I also think it's the Ugliest seat out there not going with the lines of the bike very well.
Also I went with the Saddlmen because I like the one piece seats.
Hope this helps you some more.