@indios Do you mean evaluating the entire purchase in the store (and the store), as offered by Coop, Lidl and Aldi? As far as I know, Migros does not offer this online. The Migros Cooperative Zurich has a folding card in its stores at the customer service desk or on the information wall where you can write down criticism, praise and suggestions by hand and then put them in the urn or letterbox provided for this purpose. I don't know whether this is also available in Eastern Switzerland.