I've only just ordered my first batch.
I'm trying it out and if I like the flavor I'll make the switch from Soylent.
The only combo I know with certainty that I'll be trying immediately is Huel + Coffee because I always mixed my Soylent in with my coffee each morning.
I'm really excited for their flavor packets to come to the US because that is a major component I missed with Soylent and one of the issues I've struggled with in the past has been adding too many calories when mixing in additional items on my own. "JUST THROW IN EVERYTHING!!!"
I hope you'll update if you've tried anything so far that you like!