My Take
Overall, I love Edmodo. On top of being a super user-friendly LMS, it is also a way to connect with other educators. I have attained a lot of resources from other educators on Edmodo. One suggested improvement may be the ability to pre-load a number of question sets, and then assign them as needed in one quiz. I would absolutely recommend Edmodo!
How I Use It
I use Edmodo in my classroom on a daily basis. I teach in a small correctional facility, and we don't have a need for a large paid LMS. I think Edmodo would work in any capacity, but for me it works perfectly. One thing that I don't like is on fill-in-the-blank questions on quizzes, if the word/words are not spelled exact, it will mark it wrong. It is easy enough to solve, and what I do is use short answer questions for fill-in-the-blank questions. You can also override the question in the gradebook, so it is not something that is impossible to work around. I love that my students can have instant feedback on quizzes and projects, and can submit assignments at any time, and any place!