They relieve you of carrying a separate fidget spinner, so that's less weight in your bag.
I have the version (older style?) of the panorama head that offsets the pivot point forward to be close to the entrance pupil of the lens. It has two ears that stick up with little pins that fit into the front of the Rollei. The head will fit under some other TLRs, but there are no sockets for those pins, so it's a little less rigid, but one could use it.
It's designed to cover a full circle in 10 steps, so each step should be 36 deg. The horizontal fields of view of the 75mm and 80mm lenses should be ~41 and 38 deg, so there is a little margin. In principle it would work with another camera and lens that have a >36 deg field of view (like a 50mm on 35mm film, or a 90mm on 6x7). However, how well the mount offsetting feature works, depends on the location of the tripod mount and the entrance pupil of the lens. This isn't an absolute necessity but it preserves some foreground/background relations. For large cameras this version of the head might not fit under them, due to the ears.
The pano head is a bit of a curiosity, but if you were going to do a project with a lot of multiple exposure panoramas, it would start to be a worthwhile time-saver. I keep meaning to use it for this, but haven't yet of course.