A: 1. Looks like Plausible is just a 1-page app with aggregate analytics. It doesn't give you the details about each visitor or a visitor stream which is of my favorite things about using Visitor Tracking personally. The visitor stream is one of the main reasons we built Visitor Tracking as an alternative to only seeing aggregate analytics.
2. We don't, but we have a demo video here: https://visitortracking.com/demo
3. No unfortunately we don't have a data import currently.