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The new two stage activation process is nice though, allowing you to enable VR support, but not actually turn it on until you're ready by clicking the new Activate VR button on the main menu. The behaviour of fullscreen mode is a little odd in that you can't choose which display it uses in any way other than setting the Rift to be your primary display device (which comes with its own set of issues). This is pretty awkward and requires a convar to force windowed mode, which only does borderless windowed mode, which doesn't allow for focus changing (no Alt+Tabbing out). I prefer to position my Rift to overlap my primary monitor in twinview so that I can see what the HMD displays if I ever need to take it off.
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There seems to be a bit of input lag when there's a bit of action going on (not enough to be particularly bad, but enough to be noticeable). I've spent maybe 4 hours playing TF2 with my Rift on Linux.
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