I once took 200mg and it was very intense, but not that much more so than 125-150. I did find that the residual stimulation seemed to last a lot longer as my dosage increase (like 24). This led me to feeling really crappy for a day after, but that could also have to do with not being able to get good sleep. I haven't yet seen the benefit of increasing the dose significantly. I can see the benefit of redosing after about an hour or two.
Do you get the desire to re-dose on this? I had not one second thought to take more very good thing imo. I as well feel kinda crappy from the residual stimulation. Wouldn't let me sleep so im exhausted but can't sleep heh. I can't imagine 240mg.
Also leaves me with a sense of accomplishment. I got what I wanted to out of it. So I'll take it again in another 6 months :D