I have bought lights from Ebay...but not from that vendor. I've bought from
http://stores.ebay.ca/Trust-Deals-Lights and been quite happy. I bought some 250W DE's for a buddy (6 of them) and he's been very happy. I bought a 150W and 2 x 70W as well for myself and they are great. I had one bulb not light and they sent me a new one right away after I explained the problem. Fast shipping too.
Hope that helps.