Cbtnuggets ENCOR 350-401 course thoughts?

Hi, I'm currently using Cbtnuggets for my ENCOR studies, I've seen someone on here say it's quite shallow? I'm just wondering if anyone can speak from experience, I'm currently 25% the way through the course and don't see an issue so far but of course I've never taken the exam so I can't comment on how "shallow" it really is.

Thanks : )