Self counting needles are a brilliant concept. The practical streak in me, however, needs to point out that people knit in many different ways. Yes, we all "get the stick through the hole and pull yarn through" but just watching a group of knitters will show you quite a few ways of how we do it. And some do it much faster.
Then I think about the gauge of the needles and how they're straights instead of circulars or double points. What if you combined two circs?
Great concept product all in all.