Well, I found the Coleco one surprisingly easy to use (and I have big hands). Hell, using my Commodore 64, it was my controller of choice. Found a glitch like that too. Summer Games II in the javelin event, hold down the right fire button, the guy would run super fast and giving you great distance on the throw.
As for the 5200 controllers, they were the original non self centering ones that caused me great pain in Pac-Man. Could have easily been just Dig Dug.