Hi jc,
I have an old Panasonic Massage Lounger 1260 (about 4 years old) and it does an OK job on massaging the back. It's rhythmic and it sometimes eases some of my daily stress away. I have above average muscular calves which fits tightly into the massager. It's a little too snug and uncomfortable for my liking so I mainly use the Massage Lounger for the back "vibration and thumping". This model doesn't have the arm rollers unlike the new ones in today's market. I've had no mechanical or electrical challenges with it so far.
For the first few months, I was using it about 4 times a week. Then for whatever reason, I was using it less and less. 4 years later, at most, I may now use it twice a month. My friends love using the Massage Lounger but the novelty has run its course for me.
It takes up as much room as a Lazy Boy Recliner but the styling (for obvious reasons) can be a bit of an eyesore. Best to have it in the Man Cave or Library / Study room.
Personally, I prefer the medieval body torture from the likes of the well reviewed S.E. Burnaby Nelly or Richmond's Wendy on Buswell to rid the hard back and shoulder knots.
Peace.