If I had the opportunity, to relive just one single VR experience, brand new, as if my memory had been completely wiped, I'd have to go with Robot Repair. The first time through this experience was so magical, but the amazing thing is, you can do it over and over again. Sure, it will start to lose some of it's impact with repeated play sessions, but it's impressive that you're compelled to give it one more go every so often. Just to remind yourself of what excellence in design looks like.  We have to hold out hope that Robot Repair is a mere snippet of a much larger experience. We can only hope it points towards a much grander Portal VR adventure in the future.