Overall, they have been great. In the 5 months and dozens of items I've bought, I've had very few problems. And when I did, my $ was promptly returned. If clothing, check the measurements charts, and even then often have to order 1-2-3 sizes larger. And pay attention to the reviews. And don't expect fast shipping from China. This is the trade off for amazingly discounted items.
The photo is of a cloth tablecloth I got for $3 - I'm going to use as fabric for a skirt. About a yard and 1/2 - incredible price for this quality fabric - I ordered 10 more in other equally vibrant colors. I wasn't able to upload a pic of 4 pair of sandal that are really pretty and comfy for c. $8 each. A few times I got things sized wrong, but customer service dealt with it right away.
I guess they are working on their shipping process, because they ask about every item..."Did you receive it? If so, when?"
So, it's hit or miss. The majority of the time, for me, it's been out of the park.