Need some opinions on lights

Has any one ever used this 400 watt hps set up before??

http://www.amazon.com/Electronic-Switchable-Hydroponic-Pressure-GYO2002/dp/B002J7PYSU/ref=sr_1_1?ie=UTF8&s=garden&qid=1268369397&sr=1-1

so nobodies used them before?