I've built a couple of websites with LearnDash now, and I've got to say that customer support is one of my favorite features. Just recently, Chandni, from their support team, helped walk my client through which plugins and addons we would want based on their feature requirements. As for LearnDash itself, the platform is incredibly easy to use. It is also a plugin and not a theme; which is great because themes are generally more of a pain to customize and will often conflict with other plugins. Review collected by and hosted on G2.com.
The only downside to using LearnDash in my experience is the loading time of some of the pages on the Wordpress dashboard, but that is also very server dependent. That being said it can take a while to upload courses purely based off that. Review collected by and hosted on G2.com.