Nice clean MDMA - nd there shouldnt be a comedown, unless you took a large dose..
however as we all know most of the MDMA on the street is either cut or not a very pure substance, and therefore the other subtances, can, and generally do contribute to the comedowns..
If the day i roll, i eat heathly, store loads of energy, drink regulary while rolling, etc i wake up feeling almost refreshed with a luvely afterglow...
however i do find it rare for this to happen, and i only seem to notice it while taking clean pills..
From what i know about meth, the comedown is almost absolute hell as you have pretty much starved your body for x amount of hours and used up a large percentage of the minerals stored in you.