I have a friend that had one of these in 90's. He and few other friends swore it was fantastic, but I could never fully relax to 'see' the effects. It felt like

I have a friend that had one of these in 90's. He and few other friends swore it was fantastic, but I could never fully relax to 'see' the effects. It felt like on a neurological exam, but the latter one had more intense effect (unpleasant); You know the one with strobing light and EEG. If you've been on one of those, it's quite like that but with music, hah.