There's a risk, so always remember that you just invest what you can afford to loose. But if you do so, it's an awsome opportunity to get much more money!
You are not going to lose any of your money if you are going to hold it in the long run, that way you could assure yourself that you could get the profits in time. Investing in bitcoin is the best investment for me so far, it have the higher chance of making profits than those HYIP sites out there which are investment also that are only legit for a while, but will turn into a scam after few days.