How safe is it?
Nobody can really say how safe is it. However IMO it is pretty safe to buy 1 BTC today because the price has dropped to almost $400 while it should be around $500 in the near future.
If you are talking about long term investment, even to buy at $500 is a good idea because several years from now Bitcoin will be over $1k (at least the probability of it is very high).
I hope people are not that blind on this forum. You can't make up some numbers and claiming that's what the price should be.
100% of posts here claim the same with 0% evidence.
It could be that we are now extremely overpriced and the price is correcting itself and will get lower over time until ti reaches real market value.
Be aware, you are not investing, you are gambling.