I am looking at the same thing to replace my 150 watt Daylighters. I was looking at the 9" version of this same light. I am not too worried about the housing being plastic but I would like to see the beam pattern too if you can possible get pictures of it.
I comparison next to another light would be excellent too.
Edit: Just found that delta makes the same lights for a lot more they sell them at
www.quadratec.com check it out. 630 dollars for the 9" version. Makes 240 dollars for a kit seem very worth it.