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.

I think prices will go up and down constantly changing sometimes above and sometimes below, a high price does not guarantee that bitcoin will be strong to survive long. because fluctuations will occur and driving prices down right ? so I think as long as the user continues to grow and bitcoin continue to develop then bitcoin will grow stronger and continue to survive