[DJ in FL]

Justin is good and fun. I have not seen many of his very beginner lessons.
I have purchased the LMG course and found it to be VERY detailed. For example in the unit on reading music, there are hours of drills on learning the notes. You could spend months before you move on from that unit, so students will move at their own speed.
Good stuff from both but the LMG seems to me to be a more DETAILED explanation, with workbooks and DVD's to get you on track and keep you interested.