Windows MR is not Officially supported, but it does work with some quirks. I used a Lenovo Explorer for a while and was able to play most things without issue. For smooth locomotion, the controllers will use the trackpad by default and the control sticks won’t do anything. I found a steam mod to map the trackpad to the control sticks to get them to work for me, but I think there’s a way to do it in steam itself now (I’ve since switched to a rift so I’m not sure). Another thing to get used to is that to put away loot or get our your weapons you have to reach behind your head. With the inside-out tracking you loose tracking back there, but they are all possible to do without issue once you get used to it. You have to move kinda quickly so the accelerometer can work well enough to get the position.
With my headset, I wasn’t able to do the runemage very well. It was likely a mix of the headset itself and the computer being somewhat underpowered, but tracking for drawing the spells was always jittery and inconsistent.
Ranger can work, but you have to be careful of loosing tracking if you pull the arrow back too far. I’m not a fan of the ranger anyway so I didn’t put much time in it.
Warrior and Musketeer worked pretty much flawlessly. Neither one is dependent on super precise tracking and you don’t have to reach either out behind you during combat.
There are new classes also coming with the expansion, so far we know of the Bard and Shaman and from what we’ve seen/read about them I don’t think either will have much trouble on WMR. There are 2 others we haven’t heard anything about yet.