My son had to wear the DOC band for a few months and graduated just before his first birthday. I am thrilled that we did it!!!! I think personally it was the best thing for my child. He had a completely flat spot in the back and insurance paid for the whole thing because he qualified to be 2 standard deviations away from a normal head size.
The people at Cranial Technologies were wonderful and so supportive. I personally think that it is your decision and this company feels that way too. They do not push you into doing anything. I think the previous person was wrong with her comment that it is a scam, otherwise they would be pushing these parents into purchasing one for every child.
They will give you all the information and let you go and think about things so you can talk to your pediatrician about what he/she thinks. They did tell me, that even though Matthew (my son) was pretty severe, it would not hurt him in any way if we chose not to correct it, just that he would have problems with helmets or hats not fitting quite right.
It is a personal decision, please do not let anyone else influence your decision, it's your child and you know what is best. Good luck!