I love how easy it is to set up, that you can see all of my data in one place with no need for additional software or plugins! It's very clear what each part does so there are never any questions about whether something works as expected - everything just "just clicks". The only thing i dislike at this time would be an option where we could have more than 1 dashboard page (i think they call them reports). We use mousetatst mostly because its free but also becuase their support team has been great over email when needed too!! So far our biggest problem solved was being able understand which pages were most popular amongst customers using Google Analytics before setting things like A/B testing into motion :).