Yeah, I’d heard there was a way you could pseudonymously see user sessions in Google, but last time I checked they don’t like you doing anything that allows you to identify the person behind them.
Mixpanel shows you the actual user details (username, email and whatever else you give it) for a given event stream. We’ve found this really useful for identifying leads who are likely to convert or need a little help and sending them a timely message. We’ve also found it helps us get to know our leads/customers - much easier to build a picture of someone’s needs and behaviour when you’ve got a name, avatar, job title etc. rather than just an abstract identifier.