I wouldn't hesitate to drop money on another Mustang seat in the future, if I ever found myself needing a cruiser seat. My comfort level went from an hour with the stock seat to at least 8 on the Mustang.
While everyone's nether regions are different, and no single seat is going to perfectly match 100% of the people 100% of the time, something to remember about seating............softness does not necassarily mean better. The thing that Mustang has figured out for the most part (IMO) is that they have the correct support and positioning down for the majority of riders (as compared to stock seats)
Peoples initial impression with a Mustang can sometimes be negative. They balk at the firmness of the seat, but after a long day in the saddle, most people seem totally sold on their products.
I've been hocking medical equipment and dealing with wheelchair seating for more than 15 years now, and I hear the same concerns that are voiced here time and time again. Support and positioning are what matters, and they do not neccassarily equate to plushness.
But again, everyone's got a different butt.