Right now I'm waiting for 2 more orders (I have a major addiction), but I was majorly impressed with paillettes - I almost didn't buy her heart cookie ring but I'm so glad I did!
The criteria I used is very noobish really - I just looked for even colour across each part of the cookie, as well as general neatness and durability. This piece is very very neatly finished and the pieces seem well-adhered. It's a fairly simple ring (not as decadent as Ribbon Holic) but is well worth the price!
Looking forward to hearing other people's opinions on other makers/brands :D