have been sampling this today. Its very potent (very noticeable effects from 25mg dose. In a nutshell (for me at least) is better than ethylphenidate.
Its like Eph with most of the bullshit side effects removed (no anxiety, palpitations, fiendishness or jitters) And gives supreme sharp focus to what ever task is at hand!
Doses since 1pm today are 3 x25mg. (2 hours between first dose and six between my last)