I like that it is very easy to use, no prior experience required! It's great for self-directed learners who want more flexibility in how they learn compared with traditional classrooms or courses where you're told what topics need attention first before moving onto other things (i know this sounds strange).
The best thing about engrips are their videos which help explain concepts clearly without any distractions from text/lectures etc., so there isn't much we dislike as such but if anything…