Yeah you guys are crazy with the large doses (200mg+)
I needed to do an all-nighter of manual labor (packing/moving) on about 3 hours of sleep from the night before. I did 80mg oral and did around four lines throughout the night (my lines are around 10-15mg each) and that was a very intense trip, my eyes dilated and my thought patterns got all OCDish. But I had enough energy to get everything done and I kept going and going and going until I was completely finished. It was way too much IMO.
For recreational use if I just do 50-60mg and chill out and watch a romantic comedy or something then I feel super good. If I do over 100mg I feel wasted and it is not the kind of wasted that I enjoy, not like a K-hole or something.
Granted I'm female and am apparently overly sensitive to the stuff. My brother had to do 120mg to feel energy-drink levels of stimulation and he didn't experience any psychoactive effects besides slight mood elevation. So I can't speak for everyone, but I do think that taking half a gram or something is insane even if you have a high tolerance for it.
Frankly I prefer meph over caffeine and consider it a caffeine alternative / substitute with anti-depressant qualities at low doses, but I don't think it's good or safe to try to "roll" on it, if you want to "roll" then get some molly or ecstasy. It's too bad that meph gets such a bad rap because frankly small amounts of it should be sold in energy drinks, I swear it has way less side effects for an equal amount of stimulation than an energy drink does (I once drank four monsters in a 24 hour period and ended up with major jaw clenching and bruxism to the point where I was gnawing through my lower lip)