I just upgraded to a Rumblex Plus 4 D plate. Pretty amazing. I am 72 and this is like cheating when I workout. Helps with my joints and conditions my legs and core while I watch TV. The Rumblex has more power than my previous unit, is a bit larger and quieter.
Worth every penny! I do a lot of sitting and just 10 min a 2x a day for upper and lower is so helpful in getting the blood flowing. Just that alone makes it worth it.