The research is interesting and important, but the only crucial fact for whoever is teaching your child is how your child learns. If you are teaching your child at home in a room with no other children, it doesn't matter how children in a classroom learn best. The research determines information that is true of most children most of the time. This may have little relevance to the reality of your child, or it may be a revelation to you of a new or different approach to try. The best method is the method that fits the child and the teacher.
Every child is different.
Some parents and children love it. Other people find it visually and auditorily distracting, and prefer the incremental lesson and review structure of Saxon Math. Each program has it proponents. Still others love Touch Math because of its tactile and kinetic clues, which help some children stay on task. Some parents try several programs and give up in defeat, only to find that their children learn math when money becomes important to them.