As far as I understood there aren't very many differences between this version and Jet S though they are significant.
1. This one comes with a back and knea heating. The other has only back heating.
2. Number of air compression cussions. This one has like twice more
3. The foot area here is adjusted electronically.
4. USB port which is kinda a must nowadays.
So far, two months of using the chair, everything is okay. It really relaxes as it should. The rest depends on your preference.