If the item sent matches the item advertised there are few problems. Around 20% of the time the seller is dishonest in some respect and after your money, products are very low quality or do not match description - AliExpress does little to help customer.
Example: item purchased was not fit for purpose, provided photographic evidence and evidence of other purchasers stating the identical issue. The seller was dishonest and provided non genuine assistance, I opened a dispute to resolve & aliexpress provided assistance to the seller, resulting in full payment for a useless product being authorized and no action available to me. Dishonest seller and very little support