I have the gunfighter & lady with a backrest and like it a lot. I don't love it, but I like it a lot. 300-400-500 miles are easily doable without the need for a chiropractor when you finish. The Mrs. says forget it without the backrest and my daughter backed that up this past week. It's a necessity for passengers.
Just for the heck of it, I put my stock seat back on this past weekend, and I just can't ride with it anymore! It's soft to the point where you begin to feel pressure points almost immediately and numb butt starts setting in at about 40 miles. Corbins are as soft as concrete, but you'll understand why as the miles start to pile up. The best part is that when you have to get off for gas or just a stretch, when you get back on, it's like starting over again. If you have a 100 mile butt, get off for 2 minutes and you're ready for the next 100 miles. Try that with the stocker and you will be in great pain and need traction that night!