@feruze-- Mine doesn't taste so bad, maybe you should try a different brand.
I started taking powdered caffeine a few months ago in moderate doses and I think it's great. I'm not a tea or coffee drinker so I never experienced the benefits of caffeine before I discovered powdered caffeine. This supplement makes me more energetic, helps me concentrate and I think it's suppressing my appetite too.
I know that too much caffeine supplements can cause toxicity though, so I never go overboard with it.