I try not to use them if at all possible. Shipping takes very long and the quality of goods are questionable. I got a few decent items but also many that did not work or had failed within the first two weeks. Shipping can take 1.5 -2 months from China, so it's a good wait. Then if you get a defective product you have to ship back and wait for another replacement which will take several more months. The prices are good but you pay with your time and the quality of merchandise you receive. The old saying rings true, "you get what you pay for." Often, with enough research, I can find similar products for slightly higher price but will get authentic merchandise within the week. So for me personally, it's about peace of mind more than anything.