General alcazar
Bluelighter
Just speaking subjectively; you are right that they all have vasoconstrictive properties. All stimulants do to some extent. However, the three mentioned above, particularly buphedrone, do not have much if any (at reasonable dosing) for ME. No negative effect on exercise, no chest tightness, no erectile dysfunction and veins pop out of like normal. I can't speak for others, but I can tell you subjectively that nothing I've typed is bollocks. Take it how you will... On a sliding scale of the stimulants I've tried mephedrone has the worst vasoconstriction (by a mile), and buphedrone and modafinil the least - again speaking subjectively. This includes, coke, meth, amphetamine and ritalin - not just the RCs. The only one floating around I have yet to try is desoxypipradrol, but I'm guessing it will rank at least midway on the vasoconstriction scale.