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Greg,

The Mustang seat moves you forward and higher. Maybe 1 inch forward and a 1/2" higher. The Corbin moves you back and lower, maybe a 1/2" each from the stock seat.

More importantly if you have a tender butt is the Corbin gives a whole lot more support. Even though the Mustang seat is several inches wider, it is flat side-to-side and does not cup your butt therefore that width and then some is wasted in regardings to supporting your upper body weight. The full width of the Corbin seat supports your upper body weight. Also with the Mustang unless your inseam length is less than 32" the slope is too shallow to give you any thigh support. Regardless of the inseam length the shape of the Corbin seat will give you thigh support. If your legs are really short (inseam < 30") the Corbin will "bite" into your thighs when your feet are on the ground, but Mike Corbin doesn't care about that. He designed the seat to be comfortable while riding.

The 3 different densities of foam Mustang seat feels like heaven when you sit down on one, but for me with a 34.5" long inseam and a scrawny butt (protruding ishial tuberosities) my upper body weight was only supported by an area 6" wide by 5" front-to-back. That only got me about 60 miles before I started squirming. Despite the fact that the Corbin only has a thin layer of hard foam (by design) the 14" width of support by the 9" of support front-to-back allows me to ride 130-150 miles at a time in comfort. I have put over 51,000 miles on my Corbin seat and it is still just as comfortable as when I first got it.