1. Not backwards compatible. Cant use the same boots or hoses with new "head" unit.
2. Pulse and Pulse Pro... comparable to the MVP and MVP Pro of old.
3. Improvements... touch screen, smaller size, able to use for around 2 hours without being connected to AC power. They added a timer on the Pulse (MVP).
4. No change in the "massage" type compared to the old units.
5. They will continue to have parts available for the old units.