I actually tried the Do&Co meal service on my last flight to Vienna:

On ZRH-VIE I ordered the "cold breakfast" option online. At the start of the official snack/drink service, the tray was brought to my seat (containing a nice big plate of cold cuts, a bowl with fresh fruit, a bowl with yoghurt, a bag of granola, a mini bottle of fresh orange juice, a glass, butter, cloth napkin and metal cutlery; they also brought out a paper bag with 3 warm bakery items - croissant, roll and a "Kornspitz"). Quality was excellent, looked just like on the website - I was very happy!

On VIE-ZRH I decided at short notice and ordered at the Do&Co counter just before the security checkpoints. Orders are taken until 1 hour before departure. They were waiting for a new delivery, so the selection was limited to chicken schnitzel, tapas and child meals. I decided for the schnitzel. The flight was absolutely packed, but everything was flawless - the tray was delivered shortly after they started the snack service (food had to be heated). The tray contained a plate with two big schnitzels, a bowl of potato/cucumber salad, a bowl of chocolate mousse, a glass, small water bottle, the cloth napkin + cutlery and a bag with 3 warm rolls. Food was really plentiful, generous portions, so nothing to complain.

All in all, I can only say: ^
Presentation is excellent, and I feel these 15 EUR were well spent. Will definitely order again.

I do have to get used to getting envious looks by the fellow passengers though :-)