What does the software or service do well? Google Analytics is unbeatable in terms of tracking revenue from eCommerce, sessions, users, and events. There's so much that can be done with the platform. I like that it is free and the training academy is also free.
What does the software or service not do well? I dislike the sampling on some data sets. There is a learning curve to a lot of features as well.
What do you wish you had known about the software or service before using? That data sampling was present and that the platform is limited in some aspects to what dimensions you can apply to different sets of data.
Have you used a competitor to the software or service? If so, how does it compare? No. However, I have used DOMO to supplement Analytics. I have also used Analytics tracking for Squarespace, which does not compare to Google Analytics.