I'm pretty surprised that Crescent Bay is two screens. I wonder if they're of the same resolution as Valve's screens. Which, if I'm remembering right, is a smaller total pixel count than a 2560x1440 screen, right? But maybe with the increased freedom they have in terms of screen positioning and optics you get a better result anyway.
I tried Crescent Bay at PAX East and was impressed, but at the same time a little disappointed that it didn't melt my face like the DK2 did a year prior. It's obviously better than the DK2, but the DK2 was where VR things stepped into legit useful territory for me and just a bigger leap. Not surprisingly.