I added the detachable sissy bar and luggage rack. I do believe that it improves the look. Without it the back of the Sundowner sets a little high and is more noticeable, but the comfort is very much improved.
I already have a short sissy bar. Hoping it won't looked dwarfed by the back of the seat. Other thing is I am only 5'9" and can barely put both feet down now (when I am wearing boots).
I have read on here that it sits you up higher.
As you can see, I have the Low. I am 5'9 also and I cannot say that it set me any higher. I does seem a little wider, but I have gotten used to it. Hopefully, you will not have any problems.