We've got a trial stable at work and I don't like it. It smells like musty straw, seems to be quite dusty despite watering it every day and is only suitable for horses that do not walk about much in the stable IMO. Nothing like hemcore, which I love.
I use it, sprinkled on matting, and I really like it, I find it very absorbant, the ponies are on an organic farm so we have to use it rather than shavings.