I have a Coralife 150HQI with 2 x 65 PCs. I knew it wasnt exactly top notch right out of the box when the Coralife sticker was coming off. As time passed I started experiencing flickering in the pc lights. When it happened I could hear soemthing shorting and every now and then I could smell plastic burning. Not bad, but I knew something was up. I took the unit apart and discovered that the ground wire for the PC ballast (mounted in the fixture) had been stripped (probably during initial assembly) and was grounding out on the aluminum frame. It was made worse when the fixture was on due to heat. Anyway I repaired the wire and its been great ever since.
Overall, after having replaced bulbs in it and repairing it, I was surprised that its actually constructed well. Solid aluminum with everything mounted securely. The only gripe I had was the 'rubber' bands used to hold the PC lights in place failed due to the heat. That is, when I removed the bands and went to replace them and they snapped. Thats my experience...Would I buy it again? Maybe if the price was a good bit cheaper. Again overall the quality inside was pretty darn good and I "assume" my experience was an isolated incident.
Peace.