I use the rack without the backrest. It is great for tail bags and trunks. (Larger than all the competitors). Can put my Givi trunk on it if I need a lot of storage. Holds full face XL modular helmet plus more. If I do need a backrest, I just use my Corbin seat backrest that is super easy to install. Never have used the backrest that came with the full setup.
I have tried OEM (with both the V-Max and Virago backrests), Renn-Tech, MEK, and HAC backrests/racks over the years and like this one for its versatility. (May be others. All I can remember right now). Each one has advantages and drawbacks. Depends on what you need. The HAC and MEK won't work with the Corbin seat without modding the seat. I like the Corbin more than the cut down seat (SportMax) I had before as it was way too uncomfortable in the crotch area on long rides. One trip to Waco and back (about 170 miles) and that seat was history. Walked funny for hours after that ride... :biglaugh: