Got in SGN yesterday without any incident. (surprisingly well organized immigration - they opened many boths as the planeload of people were arriving. I was there among the first, only two boths open, in 2 minutes at least a dozen were) First time though, that I was actually asked for my return/onward ticket.

Customs - threw the luggage on the x-ray belt in green channel, walked through without any interaction.

I'm obviously not Vietnamese looking