I personally wouldn't use them, I became a member and studied all of there prices. It would be impossible to sell them on eBay, to many fees, and so many people selling them cheaper than ATS Distribution themselves. I found that the prices would be just about right for a web site, a few pounds profit per item. Theres no need for any investment or to ship any products so ounce you have a functional site and the right amount of traffic. It won't be easy but with the right effort and commitment I think it may be possible.
To summarize pricing is very high, if your happy with very small profits then you may be OK. eBay is just impossible, so you will need a web site and someone with experience in promoting sites.
Just something for you to think about..