I haven't seen all that much coverage of Windows Mixed Reality Headsets yet. As far as as I know, Tom's hasn't reviewed any of them so far, despite most of the existing models launching a couple months back. From the reviews I have seen though, their reception has been a bit
mixed. >_>
Linus Tech Tips did a
review in which they didn't seem entirely thrilled with them, or at least, with the single, lower-end model that they reviewed. They also mentioned being a bit disappointed to discover that this first round of Windows Mixed Reality headsets are actually only VR headsets, and don't actually do "mixed reality", as in overlaying virtual objects over one's actual surroundings. They also mentioned that the pricing wasn't as impressive as when the headsets were first announced, since Oculus adjusted the price of their own headset to be more competitive. However, looking at the current sale pricing of these Windows headsets on Amazon, they seem to have come down quite a bit from their launch pricing, with some available, with controllers, for as little as $230 USD at the moment. I've seen a couple other reviews where WMR headsets were much more positively received, but not really from any sources I was familiar with, or would consider "reputable". What I would really like to see would be a roundup of all these headsets side-by-side, compared directly to each other as well as to the current headsets from HTC and Oculus. In general, it sounds like they have higher resolution screens than the Vive or Rift, along with easier setup without base stations, which could theoretically allow one to show off their device at someplace like a friend's house without going through a lengthy setup process that requires running cables and positioning sensors. So they seem more portable. On the other hand, the ergonomics and possibly build quality might not be quite as good, and it sounds like the controller tracking isn't quite on par with the HTC Vive, or even a Rift with three cameras. And of course, with the displays of these WMR headsets having 60-77% more pixels than the Vive or Rift, you'll likely need some pretty high end graphics hardware to run games designed for those other headsets on them.
As for the Rift benefiting from a third camera sensor, it is worth pointing out that the base package comes with 2 sensors, and an additional sensor with extension cable is just $59 USD, resulting in a total price that is still significantly less than a Vive.