It doesn't give the "alertness or kick" of coffee but it gets you in this mood of "do things".
I am a bit worried about the side effects so I haven't ever taken more than thrice a week. Unlike many others who report I don't any changes in mood. Its easy to stretch your days after so you got to be careful not to over burn yourself for the day.
Also I get a really good night sleep after a day of 'killing it' - which may just because of feeling good as a result of getting things done.