Websites go up and down, there is no need to panic right off the bat. Seems to work just fine for me though.

But answering the question about "reliable exchange", none will ever exist. We have seen exchanges just pack up and go, and we will see this in the future as well. Who and when, I cannot know, but it will be happening. This is why you should never keep any money in your exchange wallets, or at least always consider that money lost.