Mixpanel

Product is easy to understand and implement. Quick help with implementation, if we have any issues.

When Mixpanel was just starting off, customer service was exceptional. As it grew in size and the company I work for didn't grow as fast, the contact with account execs were limited, which is understandable.

Strengths: Easy implementation of scripts
Fast real-time analytics -- more than Google, New Reliec, etc.
Covers both website and mobile

Needs to improve: Pricing can get really aggressive very quickly if your website has a lot of activities or actions. No account support if you are a smaller company