I agree with Vitus, only that in my experience I got some nice effects at first, but later it turned into a headache and other unpleasant effect. I have a pothead friend though, who likes to take a 100mg PMMA and smoke a lot of weed on that, so let's just say that the effects vary from person to person, but for a large part of the population, the effects are not of interest.
Also, as the psychoactive effects tend to be relatively weak compared to the blood pressure increase it gives, there is always a risk that people ingest too much in their quest for bliss, and may experience heart problems. It is a too small safety margin with this drug for it to be suitable for the general population, regardless of if you like the drug or not.