I had a couple of them. They were more of a pain to use than they were worth.
I did just get myself however, a foot massager from Brookstone for dh and kids to "surprise" me with for Christmas. This is something that I don't have to do anything to before using it (whereas the foot bath, you have to keep it clean, fill it up, remember to bring towels, have it close to an electrical outlet, but near a chair that you can sit it, but NOT near anything can can't get wet (the livingroom carpet, etc)... and also the dogs wanted to sniff and drink the water out of it. THEN when you're all done, you have to empty it (without spilling out any water), clean it a bit, etc.
The foot massager will just sit in the livingroom and I can slip my feet in it anytime, without any other "work" to do.