I got to see him at the King Biscuit Blues Festival in Helena, AR, in '90. He didn't seem too gruff on the stage that year, but I heard from friends who went to the same festival the next couple of years that he had become increasingly cranky. I heard he had wanted to retire but had to keep performing for financial reasons. Anyway, he was great to see live.
I've got a lot of B.B. King on CD, but I listen to my Albert King stuff more often. He was a good one.