How I Use It
I've used Educreations to make math videos that are paired with the lessons in our text (http://www.educreations.com/profile/5883378/). It is easy to use, and I especially like that you can type in text, add photos, etc. Students can go home and see the lesson again. Students with iPads can project work onto the big screen using Apple TV, which results in a high level of engagement.
I like this product and used it for over a year. If you want a more advanced video creator with more features, Knomia or Explain Everything might be the way to go. It would probably be best to start with Educreations or Show Me, which are both simpler and easier to use.