Mixpanel is being used by marketing team in our company. The tool helps to analyze our websites and mobile apps and see how our users behave when using the website or the mobile app. Also, Mixpanel is great for A/B testing and our team uses the tool for this purpose.
Mixpanel has pretty powerful mobile users' behavior analytics when comparing to its competitors on a market. Also, Mixpanel offers a lot of capabilities for free, it has an up-to-date, user friendly interface, quick and very professional customer support, reports that you can create within seconds and they advertise themselves very well.
Mixpanel is well suited for the scenarios when you are trying to understand your users, especially mobile users. I'd say that Mixpanel has much better mobile analytics than Google Analytics does. I would not recommend Mixpanel for companies that do not have a particular person who would be dedicated to the tool, as it takes a lot of time to get useful insights from web and mobile analytic tools, such as Mixpanel.