Other gotchas to consider. Google Analytics places limitations on how much data you can collect, extract, and limits your flexibility to look at that data in different ways. Google samples your data while other analytic software products collects and analyzes all your data.
Also consider support and training. Basic web analytics is a rear-view mirror into ‘what happened’ on your website. The real value to analytics is when you can use the metrics to make improvements to the site and influence visitors to do things like sign up for more service offerings like mortgages and credit cards. With Google Analytics, you are relegated to online support and training and there is no one that is chartered with your success.