I think one of the guys in the article says that the sound was not too good. I think I've read the term "comically". Another problem was that it didn't work well if the singer was not singing close to the mic, so the ambient mic direct vocals on it too.
But I think it was a big improvement to what they had before.
IIRC they had the double microphone configuration in The Grateful Dead Movie (it's been a while since I have seen it). If I remember correctly, it sounds a bit different indeed.
It's probably on Youtube, so you can listen and judge yourself ;).
But I think it was a big improvement to what they had before.