I've use them with mixed reviews. At CKC I used them and had a blast, and I thought they were amazing. At home I got a bunch (can never do things just a little KWIM?) and had some probs. But I think it was the applicator tip on the bottles. I stuck a pin in it and it was better.
It is very similar to glitter glue, but the glitter is very fine, and as AWM said, it's acid free. It doesn't dry sticky at all either. For that price, I'd get more.