Re: how strong is bitcoin really?

Bitcoin itself is pretty strong and secure. Bitcoin exchanges, however, are where it becomes risky.

Definitely, If we are talking about Exchange than it really risky way, because since last few years many time exchange has been hacked, and recently BITFINEX give us the poof that exchange is not safe, these are not safe-sound way for bitcoin and also for us.
But if we are talking about Bitcoin, than definitely bitcoin is safe, because bitcoin has been spend too many years and still it is going well and up.

The bitcoin price has risen in the last few hours together with the Japanese Yen. It is regarded as safe haven.

That should have been expected. Some people have been claiming that Bitcoin will crash if the USD goes down, but right now the USD Index, which measures the strength of the dollar, goes south together with stock markets while Bitcoin has gained around $30 within the last hours. What better proof we need?

I think it will hit $800 in a day or two.