I've used Google Analytics for 12 years and always thought it was great. I tried Oribi and discovered a new world of actionable insights and direct evidence for website usage. In particular, I was interested in where visitors arrive from, even when these sites are not on the open internet. It is very easy to learn and the support team were extremely helpful in dealing with my (many) queries.
You don't have to anticipate the queries you want to run, you can interrogate the system retrospectively.
Give the 7-day trial a whirl, you may be amazed at the power of Oribi, I was.