The taste is bitter and sweet at the same time. This is one of the most bitter energy drinks I've done a review on. However, it's not disgustingly bitter, it's just slightly bitter which is actually quite nice. However, you might need a little time to get used to it. As for me, I still haven't gotten used to this taste.....definitely not my favorite.
The effects of this are normal. When I say the effects of an energy drink is "normal", I mean that it is in the same range as the normal Tivovita, S-CUP, Lipovitan-D, etc which are all about 150yen.