If you get a chance to pick him up on the "Andy Griffith" reruns on the TVLand channel, you will see him at his best.
From Google I learned:
For playing Deputy Barney Fife, Don was nominated for an Emmy Award for Best Supporting Actor five times from 1961 to 1967, winning each time.
Did you see Barney in "No Time for Sargeants", with Andy Griffin?