Personally, I'll be waiting for the second generation public release before seeing how my badly unbalanced far-sighted vision handles the experience. I'm happy to give them plenty of time to sort out all the little problems and upgrade the hardware.
I only have a hobbyist/tinkerers interest in developing for anything for this, but I figure that (in my opinion) the Rift is the most exciting piece of technology out right now and I'd love to have a play about and see what I could achieve with it.
Also, I've never even so much as tried any VR before, so I reckon the price is cheap for the chance to experience it and see what it's all about. It might be a total let down - and I'm ready for that, but at < £300 I figure it's worth a punt.