I'm not trying to be negative, I was just pointing out the results of my own research into this question when I was considering to try High Sierra beta. It's not "zero issues" as the original author wrote.
"I converted my Macintosh HD to the APFS and it will not let me boot it up anymore." https://forums.developer.apple.com/thread/80784?q=apfs
"1TB APFS Container Corrupt, Then Reinit to Single Volume" https://forums.developer.apple.com/message/247781#247781
"APFS Brand new filesystem corruption" https://forums.developer.apple.com/message/145039#145039
"Re: Corrupted APFS disk map error" https://forums.developer.apple.com/message/254468#254468
"Device does not contain a valid APFS container" https://forums.developer.apple.com/message/235888#235888
"Re: Files & file changes disappear on APFS volume" https://forums.developer.apple.com/message/241082#241082
"Re: MacOs High Sierra Beta corrupted my disk" https://forums.developer.apple.com/message/244120#244120
I'm not really interested in debating this further, so if you are not satisfied by these references let's agree to disagree :)