I picked up a copy of Rolling Stone's Grateful Dead Special Edition before hopping a plane back to Chicago. It's interesting that Bob Weir is quoted as saying...
For me, the shows we did in the late Eighties were our peak, our best era. We were real tight. We could hear and feel each other thinking, and we could feel each other, intuit each other's moves readily. Our vocal blend was at its peak too...
I found that statement strange in that it's the opposite of everything I've ever heard to be true.