In our motorhome, we use the Travasak, which is the predecessor of the RV Superbag. Absolutely love it! I read a discussion about the Superbag on these forums awhile ago. Some people were saying that the sheet that comes with the Superbag is microfiber type, and when you wash it, the velcro along the sides of the sheet sticks to it, making it a PIA to wash and dry. Our Travasak has a cotton/poly sheet. No problem in the washer. So you might check into that.
Oh, I see on their website that they have both cotton/poly and 100% cotton sheets. Maybe the 100% cotton are the kind that the velcro sticks to...I don't know.
Anyway, super easy to make the bed each day, and looks nice and neat. Takes a little practice to get a good system for removing and replacing the sheet for washing. Took me a few tries to get good and efficient at it. It is one huge continuous sheet acting as both top and bottom bed sheets.
Since it is like a sleeping bag, you won't have top sheet and blanket flowing over the side. So when I am a little cold, I zip up my side and feel nice and cozy. Zipping it up also makes it impossible for partner to hog the bedding :)
Whether it is better or worth it instead of regular sheets/blanket, I can't determine that. We've been using ours for many years. But of course we have regular bedding at home. I think we like both equally. We started with the Travasak in a previous MH that had a corner bed, so was hard to make with regular bedding. Now we have a walk-around queen, but still use the Travasak just because we like it.