Their packaging and delivery quality is one of the worst. But they are still responsive to customer requests, although that is going down the sewer as well. I get often responses that look LLM/chatbot generated and often not answering my question. Or they try something like, sure I'll get you the refund as soon as you place the order again. Then I insist they refund now and so far I always got my money back.
So, basically their advantage for me is their sortiment (but you need to navigate through a lot of fake and garbage products), free returns and quick refund (often even without a return). But this is not a very strong one and I very rarely open their website - the pile of low quality listing is so off-putting that I generally avoid.