I like that it's easy to use, has many different features (including custom variables), can be used with any website or app you want! There are some bugs here & there but nothing major so far - just minor things we're working through as they come up in our usage of this product.
We've been able solve issues regarding user retention by using changeagain analytics during each step along their journey from first visit until purchase decision point(s). This allows us see what actions users take before purchasing vs after buying which helps inform future marketing efforts such as content creation etc.,.