I love this light. I am testing it out on one plant right now. It is about 3 weeks into flowering and the flowers look amazing. The leaves around the flowers are frosting over. The plant has many flowering branches racing up next to the middle one, and I didn't prune at all. This light really does seem to cause bushy growth. I wish I could post a picture of this beauty.
I am using a 2' x 4' tent and I did have some challenges with heat. An exhaust fan was not enough to keep the inside of the tent cool, and I had to add AC, which only needs to kick on sometimes.
Anyway, I am very impressed and will be expanding to a Phytomax 600 and a 5 x 5 tent next!