The 3 virtual display on PC is appealing.
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The Best Gets Better - Nreal Air Head Mounted Display
by Craft Computing
https://www.youtube.com/watch?v=RRHC1cB8d7g
It looks like 3 monitors in a row but in VR mode. It's floating somewhere and you need to move your head to see different screens, and your laptop screen can be the 4th screen.
If the space is a limitation, then this glasses is a pretty good solution. But for daily use, I'd prefer physical monitors too.
@skyblond Yes, you have to move your head to see the different screens. That's what I mean, with a real setup you rarely need to.