I also used Aplia as a TA for Principles courses. I am going to be using Aplia this fall for my own Principles course and a Corporate Finance course. It's really easy to set up as the instructor. They also have these great experiments for economics that the students get to be buyers and sellers in a market and then you can mess up the market with price ceiling and other things. I've participated in these types of experiments and I really think my students are going to love it. I'll keep you posted.

I haven't tried to access Aplia on my edge but I don't doubt that the Android upgrade is necessary.