I use Ethnio every day - my team does a pretty high volume of qual UX research, and this gets us direct access to our users through intercepts, and lets us schedule and pay them pretty easily. Did it take me a while to learn? Yes. But most of our studies aren't that simple either, and we do mostly international remote testing, so I need tools that accommodate a lot of different scenarios.

Ethnio's good quality is that it screens/recruits AND schedules. Otherwise, there's not much else to like, unfortunately.