I've used Piwik myself for years and swear by it for all of my personal projects or sites where I need full data privacy. It provides all the basic data I need for my clients and then some. Also once it was setup I've found maintenance to be pretty simple. I use it for regular web sites, WordPress sites and MediaWiki installations.
Granted, I miss the days of being able to use tools like Analog but it's so badly out of date and not maintained anymore so I only use it when I need to process raw traffic numbers from a server.
Granted, I miss the days of being able to use tools like Analog but it's so badly out of date and not maintained anymore so I only use it when I need to process raw traffic numbers from a server.