My Take
Starfall is an excellent addition to any classroom K-2. It is easy to use, the children quickly learn to navigate the app without help from the teacher, it provides leveled activities in reading and math that the children want to repeat over and over. Highly recommend this program.
How I Use It
I am lucky enough to have found Starfall back when it was in its first years (used to send free pencils). I have used it for the past 25 years if I'm right about that, and have not had a class who didn't use the program with enthusiasm. What works for me is the level of engagement (high), the repetition (again, all about the engagement) and differentiation Starfall allows in its games and activities.