So far, i think it;s been good.. relatively low heat, hardly feel it. Brightness wise, it;s bright enough, coverage wise, ours is 3X2x 20 inches height and almost full coverage using one since this is the 156w model. The blue lights are also more natural. One other good thing is the blue and white light overlaps so you don't see some blue, some white area in your tank, unlike say Par 38 or some other LED... so far quite happy about it.
Bad thing, well, there's no gradual light, so it's on/off white, blue or both.