I agree with all of you saying it's stereo when using bluetooth playback or going through the aux in the back with a Pod or whatever. Headphones; yes, it's clearly stereo, and also if you send it through a PA.
However, all of that kind of defeats the whole point of this amp, doesn't it? It's supposed to give you a nice stereo feel when playing directly through the amp! I have found that I CAN detect the stereo, but there is clearly some of the delay signal coming through the main speaker, which is in conflict with the marketing. Anyway, although it's a pretty good sounding amp and fun to play with, I'd say it's not living up to the hype. My opinion :)
I used a Peavey Stereo Chorus back in 1990 or something. Now THAT was stereo! To 12" speakers, and the chorus and delay was totally dancing around in the room. Haven't been able to find it again :(
(Also, I am getting increasingly annoyed with the absence of controls when NOT using iPad etc. but that's another topic)