Not worth the effort
I have used Hungry House a few times but I fail to see any advantage on simply calling the restaurants directly. I was sent an email offering a 15% discount, but despite using the link provided, with the promise that the discount would be applied automatically I ended up paying full prices anyway. I sent an email to firstname.lastname@example.org, but received no answer. Instead the next day I received an email asking me to rate the meal (an email which detailed all the items I had ordered and the price I had paid, how ironic), and another one asking to rate the website. I see no reason to use this service again.