There was an interesting thread about Nutriberries a few months back...
click here.

I wouldn't say they are "good" for Quakers. They should be considered a treat and fed in moderation. Nutriberries are basically seeds which Quakers should only be fed as a treat since they are prone to fatty liver disease (which is why they should be on a pellet diet). They also contain sugar, which isn't good but in small treat size quantities is okay. Our Quaker Casey hates them and will just throw them on the ground so we don't buy them. If you feed your Quaker a well balanced diet then the occasional Nutriberry offered as a treat shouldn't do any harm but I wouldn't make it a staple in the diet.

There is a lot more info/opinions in the link above...
Hope that helps!