I know most of you have heard bad reviews about this one, and honestly most of them are true. There are a lot of sellers there that live only to scam you with defective products. However, if you are careful and pay attention to their profiles, these ones are pretty easy to spot.
Once you filter them out, you can deal with the honest ones. I bought a lot from there, not only tablets but also mp3 players, mini laptops, hats, bags, accessories, as well as other stuff and was almost always satisfied. Some of them also offered nice discounts and free gifts when I kept buying from them, and there are a few that aren't as reluctant when it involves sending replacements for defective products (as long as you show proof).