I've been using Sammydress for several years and I love it. I've gotten some great items for amazing prices and have been really impressed by the customer service.
I think sometimes people have negative experiences because they don't pay attention to a few things: 1. Don't go by your normal size. Instead, use the measurements provided for each item. For one item, you might be an XL and for another you might be a S. 2. Pay attention to the details and material of every item. I usually try to avoid the clothing made from polyester, which can sometimes feel cheap, but many of the cotton, cotton blend, or chiffon items are lovely. 3. Look at reviews from other users if they're posted. I look specifically for people talking about the material and fit. 4. Try to do expedited shipping and include shipping insurance if you can - that gives you a tracking number for your package. With expedited shipping, I've gotten some orders in less than a week. That's amazing when the items are coming from Asia! 5. Recognize that you're buying clothing that may not last forever, but that will often be good for a few seasons and that has saved you money! 6. Reach out to customer support if you need it - they're quick and helpful.
If you're a smart consumer, you can revamp a huge part of your wardrobe for very cheap and get cute, trendy clothes for cheap. I LOVE Sammydress!