I like how easy it was to use; you can get all your data in one place! It's also very intuitive once you start using it.
The only thing that could be improved would be if there were more options when viewing certain reports or metrics. For example, we're trying to track referrals from Facebook ads but it doesn't seem to give us any results at this time - so we have no way of determining what has worked best with our ad campaigns. We are able to see which pages perform well and where visitors come from so far without having to pull out other tools.