Homedics massage cushion for very VERY bad back, which one to buy?

[poppingin1]

Looking to buy one of these as I had a very severe back spasm a couple of months ago which I need regular massages to help with.

Any recommendations? They all seem very similar to me

I'm interested in this too, saw a great one, and tried it out in The Range once, dithered, went back a week or so later and they had all gone. i never got to note the make/name. Grr! You could do with trying them out, some are not good at all, not much pressure. Some have too much force for some people.
Sorry, not helpful.