So, I've been working much of the time (30-50%) through the Quest, using ImmersedVR to have 3 screens from my Mac in VR. The headset is super comfortable, even for long periods of time; the only downside comfort-wise is that if I'm breathing out of my nose, it'll end up blowing upwards into my eyes, drying them out (but I'm going to be making a little buffer piece to fix that).

The fidelity is at the low end of what's usable for productivity without causing discomfort, but it's just going to get better from here. To me, $400 for the Quest is a total no-brainer; the Magic Leap .... not so much. I'd rather stick entirely to VR, but I have a kid to watch much of the time, so AR it is!