I have the quick disconnect sissy bar and longhaul backrest pad. It is VERY comfortable and doesn't lean "too far back". Wife is 5'7", sister-in-law is 5'2" and both like it. Just for the hell of it, I went out there and sat on it myself [6'4"] and even I like it.
Congrats on the new bike!
My wife likes the sissy bar and backrest pad too. She's 5'5", has no complaints about it. The stock passenger seat though, that was a different story. I have the longhaul dual seat now and it's all good.