I give my Degu's as much variety as possible and they adore the JR Farm Green Oats. I spread it in the hay and then the dig it out and slowly munch on it for hours, keeps them occupied and is very good for their digestive system as well as nutrients. Green Oats helps keep them from getting really bored and i know its good because they fight like cat and dog over it :)
After fresh grass, this is their absolute favourite. The first time I gave it to them there was no hesitation, they just hoovered this stuff up. A lot of new products just end up in the bin, but not this one! I wish I had discovered it before.