If you already have a system capable of running VR and have the money to blow, go ahead and get VR. I have the Oculus Rift. My brother had both a Rift and a Vive, so I got to try both and decided the Rift was better for flight sims. BUT, as many have said before, the resolution is horrible compared to any flat screen display with 1024x768 or better. Because the resolution is spread over such a wide field of view, it is effectively somewhere between 640x480 and 800x600 with a flat panel in terms of being able to read gauges and see/identify distant contacts.
Aces High has one of the best VR implementations out of all the available flight sims, though DCS World and IL-2:BoX have very good implementations as well. If you are primarily flying air-to-air in Aces High, it is a great experience, except that you have to get really close to see the enemy aircraft's shape and attitude really well.
After flying VR, I am faced with a dilemma: the immersion of VR or the graphics quality of TrackIR/2d-monitor. No matter which way I play, I miss the features of the other. So I am roughly flying about 50% each way, though in Aces High I tend to fly 100% VR as the cockpits don't have digital displays with text that need to be read and the default icons overcome spotting/id problems even if they don't help with the exact attitude.
If you are on a budget and/or have a weaker PC, I wouldn't waste the money trying to upgrade enough to play VR, yet.
