I've played with the ML and HoloLens and they are comparable. As someone who was raised on 8-bit games, it's mind-blowing. But really none of them are sharp enough to make you suspend disbelief that you're seeing something that isn't there. And I haven't seen any remotely compelling use case that would make them worth spending even $500 on. VR is much further ahead. Not quite mainstream, but it's got a real consumer niche and some really fun games and commercial uses.