Apparently it's not the same ingredients as the US originals. It made me fart a lot. Saved 30min/day for lunch at work though, which is nice. I finished my batch, but did not get new. If a mix based on the 'real' recipe was available, and cheaper than a cheap meal (einen Falafel in Durum, bitte. Pikanter soße) I'd be all up in that stuff.
From what I've read, farting is a problem for most people when changing diets and suddenly adding much more fiber than they were used to before. It lasts for a while and then allegedly stops.
People who start weightlifting and change their diets completely also often complain about farting, even if they are not taking any supplements. Check the weightlifting forums for other tragic experiences.
When this will appear as a Joylent flavour (instead of all these bananaberries) I'm gonna subscribe :)