At this moment we can say that Bitcoin isn't something new and has some history that could be researched so anyone could make some research can see that Bitcoin is very volatile and unstable and therefore very risky. It isn't anything different than any other investment so there is no guarantee that your money will be safe and that you will make profit.
Well for me, bitcoin is reliable but unstable investment. First, it is decentralised currency, not controlled by the government, volatile and risky. Second, yes bitcoin is reliable but then you should know first what is this bitcoin is, how to deal with it and of course learn how to trade and play with the market fluctuations as safe as you can. And yes this is just like an investment in real life businesses, no guarantee if you will earn you ROI in high amount as your investment or you're might lose it.