I have some. They seem to eat it without a problem but then my guys will eat anything. It's smaller than I thought... smaller than the Hidaki pellets and they give you a spoon to use. I tried feeding mine about 6 little balls. I just have mixed feelings about it. Others have tried it with good results. No one is sure just how much water it absorbs and enlarges once in the stomach. One person reported that his bettas had clamped fins after eating some for about an hour. It could be he fed too much as would be the tendency with a spoon.
At any rate the breeders are all lining up to buy it and use it. Only time will tell. I'll put it in rotation with the other food.