Yes, I used it. My son started it closer to about 12 months, but I do plan on starting my daughter around 4 or 5 months. My son loved it, and I was actually so impressed that I bought it for a friend with a baby and he has told me that his son loves it too. Hint - check Ebay - it's usually there for a better price than their website. I do not necessarily think my son learned to read from this system! I want to make that clear. However, it really helped his vocabulary. He was slightly behind in speaking at the time, but after watching these videos he learned all the words and still uses them appropriately today. In fact, his word for "television" for a few months was "Aleka," (the name of the child in the video). Some people will probably say that it was just coincidence that he started speaking at this time. Maybe that is true. However, it is only 20 minutes a day. I ALWAYS watched with him and said the words myself. And I LOVED to see the smile on his face when he was saying the words. I could see that he was so proud of himself. We do read to him every day, and he has always loved his books, but I think these are a great supplement. By the way, we are now onto "Preschool Prep Company" videos and I can say the same thing about those. After just a few showings, he has become much more sure of his alphabet and his numbers, and has almost mastered his colors and shapes. He is amazing on sight words - possibly because of previous exposure to YBCR.
If you get these, I would love to hear your opinions!