Honestly it is a pain in the ass when you get some Joe Flyer that thinks he is impressing you with his hand flying skills in a heavy work load environment. Leaving ATL, ORD, DFW these places get hairy enough sometimes for the pilot not flying that when you now have to manage the bugs for the "Hand Flyer" calls get missed or confused adding to the work load. Frankly, turn it on and its a much easier job. Have a little consideration for the non flying pilot and go rent a Cessna if you want to impress yourself. my $.02