I've had the new lights running for about 6 weeks now. Most of the corals have responded well to the new lights. However, I did have a few corals that got burned by the new lights so they've been moved to areas with lower light levels and are recovering.
The new lights have definately brought out the colors of the corals. It's too early to tell if growth has increased although it does appear that some pieces have begun to grow faster.
I got a bunch of new corals from ReeferMadness in December - 3 nice colonies of SPS as well as about 30 assorted frags including SPS, LPS and mushrooms. I lost a few of the SPS frags to RTN but most of them are doing well and beginning to encrust and get some nice color.
Of course finding a place for everything required moving some rocks around to make room for everything so the tank looks a little different now. I've been trying to get some decent pictures but the 20K bulbs make it tough to get the colors right. Once I figure out how to get the white balance correct, I'll post some more photos.