Bitcoin is good investment but I wouldn't suggest to put all your money into it. I wouldn't suggest puting all your money into anything, not just Bitcoins. Every investment is a risk and there is always the danger of losing money so you have to invest with care and you always have to have some back up. Don't ever invest more then you can afford to lose.
Of course, remember the main rule of investment ; do not put all eggs in one basket. Because if it doesn't works, your heart will crash hardly. I don't put all of my funds on bitcoin instead divide into ; 35% cash and 65: bitcoin. Well, bitcoin still become the best way to saving in my opinion due to it grows over time, not like fiat money which the value decrease due to inflation.