I find them deeply upsetting, not one step above the phone robot on Vodafone support: "press 1 for internet problems" ... "press 2 to be transferred to a human representative". Only problem is going through like 7 steps until I can reach that human, then waiting some 30 minutes until the line is free.
But it's the only approach that gets anything done. Talking to a human.
Robots a a cruel joke on customers.
Chat bots like this, where basically they're executing a wizard type questionnaire seem totally reasonable to me. It's approachable to a wide audience, only asks you one question at a time in a clear way, and can easily be executed on a mobile device or normal computer.