There are also the Mind machines [1]. At least in Europe, there's still a company Galaxy that sells them under the "psychowalkman" name.
I've used about 20 years ago. It wasn't unpleasant, but also without a big effect. I think it was because the overall feeling was a bit like a medical examination. You put plastic gear on your eyes and your ears, tangled cables everywhere... and then you're supposed to relax.