From what I understand, Ritalin is prescribed precisely because it has much less of that 'euphoria' than, say, Dexedrine. In my completely subjective experience, Ritalin causes less 'euphoria' than caffeine. Granted, I think Caffeine, especially the first sip after going several days without, feels quite good. But, if I am on vacation; I mean, real vacation where I am not working on anything, I don't take the Ritalin. I feel better without it, if I'm not trying to do something.

It is very important, if you do use psychoactive drugs, to have some sort of external metric. When I was undergoing various ADD treatments, I had my boss evaluate me every week. I found that what I was doing before (that is, using unusually large amounts of caffeine) was not better than baseline me.