Well, I will be interested to see what he thinks of it. He's been through RS A & B, some of Miquon Orange, but I lost confidence with my ability to teach it, and we're in LoF Edgewood. I got the MM light blue download during the last HSBC sale. He's cruising through level 2 on our ipad. I think I'm going to do it mostly orally when we start back (we're on our way home from vacation), so that his handwriting doesn't slow him down, especially since he's using a stylus. So far it's all review, but I was afraid to skip ahead too far and miss something. He's my first, so we're pioneering this homeschool world together.
I don't mind paying for BA since MM was so cheap. If he decides he really likes it, I'll still have MM to add in review if I feel like he needs it. There certainly isn't a shortage of options for math out there.