Just wanted to say that with the Coronavirus shutting down schools, I'm now going to be requiring my students to use renshuu as part of their daily study routine. I'm having them send me screenshots of their 'end quiz' pages so I can check what they've been studying and how they're doing it (it would be SO GREAT if there were some way of tracking that to use in this kind of setting, hint hint for future betas!) - so far everyone new to the site seems pretty stoked about it, and the ones who have been using it are ready to go!
I'd say the majority of them - the kids who enjoy studying/are excited to learn Japanese - are really into it! They tend to like it more than other quizzing sites that I use (like Quizlet). In fact, there's a few of them (who might read this, you know who you are!) that I have to ask to get *off* of Renshuu during class, because they're playing Shiritori instead of paying attention!