I have a Rift, still haven't played Elite Dangerous with it, and that's all I play. I know the immersion factor is crazy, but unless you can work a HOTAS blind, I'm staying with the flat screen. I don't want to be taking that HMD off every time I need to hit a key or touch a button my fingers aren't used to yet. Plus, I play in 4K, and I'm not sure I want to give up high res in favor of the immersion the headset offers. I *will* give it a go once the HOTAS becomes second nature, but that's a long ways off.
Love me some ED though. I'm as hooked on this as I was on Fallout games, maybe more so!