in my personal experience having never used gear the only changes of noticed by radically upping my calories is increased strength & recovery and bigger poops
but it works pretty well after a depletion phase ie. going lo cal and getting ripped, coz then the body is primed and ready for the extra cals
i'm in my 3rd week of this and it won't last much longer til i start getting "fat"
maybe 3 more weeks if i'm lucky
the key to it all is making sure your training poundages go way up, coz then that's a signal that many of the extra cals are being used to build and add lean muscle tissue
i'm hoping that i cam get another 3 weeks out of it, but we'll see...