We had one implemented but removed it. It only makes sense if you can immediately answer. So, you basically need a customer service person for that... 24/7 - Mo

We had one implemented but removed it. It only makes sense if you can immediately answer. So, you basically need a customer service person for that... 24/7 - Most of the time a well written FAQ is enough. For feedback i would rather recommend a feedback widget like STOMT provides it. Edit: If you can't answer immediately or have chat bot in place that is actually really good, it may turn out in a bad user-experience.