TBH I can't hear differences easily, I hear the dynamics my version of the supa brings to it, but UH or offset, top swivel or string all sound much the same to me. Just my rolled off cloth ears. I like the design side and building stuff, and I'm grateful to the people on here for making it interesting hobby. I get more out of music when I build stuff.
I don't hear any difference between bearing, string or cable. The main advantage is to eliminate the torsional effect the hoists have on skating forces.
I do hear a difference with the UH version of the Supa....another boost in dynamics...the main reason my bothering with the implementation.