I am quite happy and satisfied with Etsy. I haven't bought much though... or rather I should say that I have till now bought hand made jewelery from one seller.
She is good and offers authentic stuff. Shipping too is on time, stuff is nicely packed and all jewelry comes in gift boxes (an extra bonus!).
Her shop name is myglitteringworld and she also recommends few shops to buy other stuff like painting, paper decor, etc. Since shopping has been a good experience so i guess has some good sellers too.