it can produce a phasey effect
There are a couple interesting things about the effect I demonstrated there. If you listen to it in headphones, you still hear the spaciousness, but now it's actually happening in your mind, not actual phase cancellation in the air. If you happen to have the ability to mix both channels together and play them through one speaker, the effect completely disappears, it goes back to sounding like the original mono (the comb filtering on each channel is 180 degrees with one another).
