Haven’t used it myself but I see them delivering in the neighborhood (ZH city) and the offer* looks quite fair IMO:
*16.90 CHF for a full portion, including delivery and every day sth else
It’s not a ‘private chef’ that comes to you and cooks for the whole week but they cook it at their place and then deliver. If you really want a private chef, of course price would need to be much higher (or you eat 7 days only lasagne).
Surely you’ll save money by picking up a Döner next door, or buying some precooked meals in a supermarket, but for long term that is often not healthy.