I recently got an Oculus Rift Dev Kit (just yesterday in fact). The two things I immediately noticed were the "judder" Abrash describes, and more importantly, the lack of translation. Oculus is working on translation, but if they cannot get it in place the product will not work; I got motion sickness very quickly because of the lack of translation. Also, needless to say the resolution is really bad but will get better in the consumer version. It was the best VR I have yet experienced, but I was not really blown away like many reviewers were -- interestingly the only person I ever heard sound hesitant about it was Carmack, who noted that it still had a long ways to go.