Just to echo the good points already raised here - well considered cheat meals can work wonders in the right circumstance, but unless someone's blood is swimming in T3 and they have unusually high insulin sensitivity, 'cheat days' are complete bullshit IMO.
I can remember going to a show where someone asked Ronnie if he did cheat days and he was like 'nah man it's pretty much the same boring shit every day' - and we can only speculate the the amount of shit he was on at the time