So, after reading the Anandtech review of the Rift, I'm starting to have doubts on buying a VR headset right now. Is there any reason to hold on to a pre-order that would probably ship March 28th?
Well, that's definitely a personal decision. VR is is bleeding-edge, early-adopter technology; it's not going to be perfect, but if you're really into it, then you'll be pretty hot to trot for the gen 1 gear. At some point, we'll hit Michael Abrash's 120-by-120-degree FOV @ 8K-by-8K resolution, along with a wireless connection & long battery life, but it's going to be a few years before we get there.
I got hooked with the Viewmaster, then picked up a Gear VR, which I absolutely love (just wish there was more content!). Looking forward to the Oculus & Vive combo; not sure which I'll keep long-term (I suspect the Vive, due to the Lighthouses & controllers). If you have your doubts about it, keep in mind that it is a pretty hefty investment - $630 shipped for the Oculus, plus a $1,000 gaming computer (assuming you don't already have a rig that meets the specs). $1,630 would amount to an awful lot of buyer's remorse if you're already not sure about it now.
On the flip side, Playstation just announced that their VR headset launches in October for $400, so if you don't mind console games, that might be a better solution for you:
http://www.engadget.com/2016/03/15/sonys-playstation-vr-headset-launches-in-october-for-400/