Pity, because the hardware was alright
I bought a Lenovo Explorer a number of years ago on Black Friday for the bargain price of 150 quid. Decent visuals, controllers are OK too.
The WMR Portal, its interaction with display drivers (throws a fit every time a new driver release is installed), and Steam VR integration are a different matter. Whilst native WMR apps are smooth, Windows Store is horrid, and there's virtually zero Windows Store VR apps. Steam VR does work, but it took some time to fix various niggles, and patch games such as No Man's Sky. Nowadays it should be fine : I tried Skyrim VR and a few other games a while ago and it Just Worked.
Oculus/Meta's interface is an order of magnitude easier to use, and looking around it basically seems a Meta Quest 3 is the best option unless you're absolutely desperate to run a Vive under Linux.
Haven't played with much AR - too many platforms and games already, but the VR killer app for me is Google Earth. Not everywhere is mapped, but when it works well, it's absolutely stunning.
SuperHOT VR, and Lone Echo (Oculus only, without hacks) are pretty decent, but Google Earth is the stand out item. I also really digged being able to render 3D mathematical shapes, pick them up, and manipulate them virtually but I'm not enough of a mathematician to make best advantage of that.