Update - below is my original review, but I want to share the most horrible story that happened to me at AliExpress. After opening a dispute and leaving a negative feedback for one of my purchases, the seller started calling me at night hours threatening to find and destroy my family. I reported that situation, but AliExpress did nothing to stop the harassment. Be very careful when you share your personal information in AliExpress.
OK, this is my time to write a review. First positive side - there are many good sellers, and some goods that I bought was good. But I believe that people read those review to learn about possible problems. I have made many purchases in AliExpress, and can share this information with you.
1. Colours. Several items that I bough, like silk and cashmere blend scarves, were different colour. S And I don't mean slightly different, but significantly different. The sellers said it was chromatic aberration. I believe some of them use Photoshop to make the colours more attractive.
2. Pictures. Some sellers show you photos of celebrities carrying their bags. The same celebrities' pictures, but different bags in different stores. It looks like they use some kind of template.
3. Clothes. They show you very attractive pictures of models from catalogues or fashion magazines, but the real goods that you get is lower quality and made with cheaper fabrics. I bought a dress, and it was not well made. The alteration to fix the defects would cost four times more than the item itself in my city. Please note - that there were some good reviews about this dress. Probably there dresses were better than mine.
4. Sizes. I bought a winter coat based on the size chart on the product page. The real measurements of the coat were three sizes smaller.
5. Materials. My coat was advertised as a warm winter cotton coat with 70% down filling. In reality it was thin 100% synthetic, no down, no cotton at all. My friend purchased several bags that were advertised like leather: patent real leather, or genuine leather. There were even pictures how they treat the leather. What she got was not leather, but PU.
6. Packaging: I bought an expensive bag, which arrived deformed because the seller did not put it in a box. I bought sunglasses, and the box was crashed.
7. Quality. I bought a necklace on a chain. After few wears the chain became black instead of yellow.
8. Items not as Described and Returns. They require you to pay for the back shipping, but the shipment cost to China was more expensive than the item itself.
9. Defects. I got a scarf with many threads pulled out. The seller advised me to cut the threads with scissors.
10. Counterfeit items. I bought a lipstick that clearly showed Dior name on it. The real lipstick was not Dior, and the small box was from another lipstick. They will sell you Chanel creams for $20, but that is not real Chanel.
11. Dispute handling and escalation. My last dispute handling took about five months, and at the end they simply released money to the seller and didn't give me any refund. No reason was given. The seller continues selling her products and tricks other customers.
Hope this helps.