I've been using the Starter Series DD for over a year. Very good physically, big movement, and cognition. It would be an improvement for me (and probably others, if Nate did not use letters B. C. D. E for hand and leg movements in some of the exercises. It's too hard / impossible to tell which one he's said, and while I'm fumbling around I get behind and use coordination. So please use letters that sound different A. B, F, H, etc., or numbers or names that don't rhyme.
Thanks so much for writing. This is perfect feedback for me. Thank you so much. I am going to go with different letters from now on! I never realized you couldn't make out the sounds of the letters I was using. This helps a ton!!!
All the best,