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I have the HD adjustable and really like it. I find that I do like the ability to adjust it on the fly especially on longer rides.
Same here. The adjustable model has a gas shock that pushes it into you, you press the lever and push yourself into it until you find just where you want to be. I rarely adjust mine, mostly on long straights with the cruise set and feet up on the pegs to make a small adjustment if I want to.
The backrest is a big help when you are backing up your bike, especially a small incline. And, it's easy off when you prefer your passenger's double D backrest instead!