I cracked and bought it. Not the EVH model, just the regular. With the IR-200's effects loop I can mix my dry in without a third output.
It's expensive but it sounds fantastic and it's as versatile as I'd hoped it would be. Two stereo delays, each with independent left and right times, that can be mixed in three different configurations, plus modulation, phase reversal, ping-pong, offset, a very flexible tap tempo, it's a lot of horsepower. The DD-500 is probably a better value with its wider featureset but I don't know if it can do everything this can either. If you want this specific sound, it delivers big.
But for me, my favorite part is the interface. That was honestly the deciding factor between this and a DD-500. I love the big, bold and blue digital readout that I don't have to kneel and squint at to read.