A final point to add is this stuff is defiantly highly addictive. People often go on about how addictive things like opiates, coke, smoking, drinking etc. all are and fully understand how 'moreish' certain drugs can be. However, I personally find it very easy to binge on any substance and never strongly crave it again but unlike any other chemical I find myself constantly wanting to just have a small taste of MPA to make everything seem better.
I must say MPA has been very addictive lately. I've been parachuting eyeballed dosages every other day or every other 2 days for the past weeks now, sometimes staying up in excess of 24 hours. In my opinion 'moreish' is an understatement, but then this may be pure personality; I generally find that after the initial rush is gone, I want more of something that wasn't really there to begin with. Then when I realize it's no use going to sleep in the early morning hours, I will decide to keep going until evening comes. Since few others have reported any such effect, I will chalk this up to me being used to cocaine and chasing a high of sorts.
Weight loss and excessive sleep (duh!) were noted.
Face, back, chest, penis, i got this weird lump smaller than a pea on the shaft of my dick that had pus in it,

, my cousin got these smaller pimples on his chest after using rc's with me for the first time, and my other mate who goes real hard on MPA all of a sudden breaks out with these 2 fucking huge boils on his face, if anyones had anything like these please say
Those sound like pretty severe side-effects, would not touch that batch/vendor again! I have had none of the symptoms you describe, I can't imagine them being MPA related, but with RC's I suppose nothing can be ruled out.. Yikes.
One more thing; as was commented before, I do find taste is affected in a weird way, even when parachuted! Cigarettes do not taste like cigarettes at all indeed, and wine or other drinks taste 'off' as well. Generally a familiar, slightly foul taste will manifest in my mouth after a number of hours, although this might be simply related to dehydration.
Will probably not use again, since its initial usefulness as functional stim seems to be negated by my tendency to binge. To me this seems like a rather personal flaw in thinking where I confuse MPA's stimulation with a high that ought to be enjoyed and prolonged.
However I will maintain it is excellent for getting mildly complicated chores done; grinding and boring tasks are done with dedication and precision, and things generally can be accomplished (as one would expect from amphetamines). For more subtle or rather cerebral tasks (reading long texts, writing) it did not seem to be very helpful; the prospect of just reading a text seems like a waste of time, and there was a certain tendency to unnecessarily explore and research concepts not pertinent to the tasks at hand. Again this may be attributable to the false perception of experiencing a high rather than plain stimulation.