I have had no problems with them, but my cousin hates them now. They sent him the wrong mags, he had to ship them back on his own dime and they still screwed it up and charged him more shipping for the wrong items
Ordered many items from them. Every now and then CDNN digs up stuff that no one else seems to be able to find. Prices are usually very good too, and every now and then they have discounts on shipping.
A great company to deal with. I've mainly bought magazines from them. They had the cheapest price on C Products steel AR mags with the Magpul anti tilt follower.