I'm using DX from 2009. There is a veriety of choice, usually with good prices, a little bit higher than Ebay, but you have better customer support, forums and reviews for each product.
It usually takes 2-3 weeks to deliver the package to Poland. I had a problem two times - two packages came broken on arrival, and DX gave me money back - I really appreciate it.
Sometimes the description is missing or the quality is a lottery, and noone knows the details, even the stuff - this is the worst thing on DX.