I like that it is easy to use, has lots of features (including quizzes), allows you take notes in class or at home with ease! It's also great for collaborating as well because everyone can see what each other are doing/writing without having them email back & forth all day long!! You have an option between "text" mode vs typing up everything yourself; this comes handy when someone else needs help writing something down but doesn't want their handwriting showing through everywhere they're working from - text-mode works perfectly here too.
The only thing about engrips website which could be improved upon would be its search function so we were able to find things easier than using our own google searches sometimes haha. If anyone was looking for one simple tool where students had access to resources easily while being able to collaborate together then look no further. !