-The dev kit resolution would not be worth buying (it looked like a pixel painting that moved) -Playing a flight sim - when I was calm and flying it was amazing (but gauges were worthless unreadable) - as soon as the bad guys came then turning my head would be come worthless as well because of the blur - I started to get sick when i would move my body and not have the screen reflect that movement - if i stayed still and only turned my head i didn't feel "wrong" - no eye strain at all
I think these guys are fully aware of all the issues above and are really working to make it a success. If waiting for better screens is what they're doing great - if they're working on adding additional body tracking great.
My point - you REALLY don't want it yet (based on the first dev) and they're obviously making sure they get it to a level to make sure when they ship you're going to want it.
Far as I can read - everything they're doing is problem solving and that's more than you can say for Halflife 3 (i just had to be silly)