I have an aqualine buschke system. It is HQI. The reason I went with coralvue is because it is very difficult to find 250 watt 20k bulbs in HQI. They make them, I decided to give them a try and liked what I got.
I have coralvue electornic ballasts and 10K coralvue bulbs. Great customer support, one ballast need to be replaced and they sent a new one right away even before I returned the bad one. I really like them but wish I would have gone w/ the 20K bulbs instread.
I use 20k 175w and like it quite a bit. They are blue but IMO do not alter the colors of my corals all that much. I will probably try a 10k in the future. As for the company, I think the product is excellent. You can get great deals on them at www.diyreef.com .