I think the whole concept is stupid and wouldn't waste a cent on it. I'm the mother of four readers (oh, okay, DS turns 3 this week and isn't reading yet!). I think the focus is all wrong. It's not about getting kids to read early--it's about a lifetime love of books. At least that was always my goal. You want them to feel that comforting feeling of curling up with a good book--on a lap when they're little, on their own later on.
As it happens, my 3 older kids were all reading well before the started K. I did work with #2, because we were told he would have difficulty learning to read. The other two, we just read to them a lot, talked about letters and sounds, etc. as part of our normal day. They love going to the library, and even the youngest likes spotting letters in the grocery store. Songs and music also develop language skills.
Seriously, I think any program that claims to improve your child's development is silly. There is so much you can do as a parent just in your regular routine, that help your child--counting cans as you shop, spotting colors while taking a walk. Nobody "needs" a special system to get a child learning!