I've recently installed a couple of G4 Pros over my 72 and I have to say that they are Sweet!!!. I replaced a Reefbreeders V2 that I had recently purchased and these lights eat the Reefbreeders for lunch. I don't have a lot of hands on experience with LED's at this point to compare them too. But These are impressive. I've noticed that the light spread is much better and Software has some cool features. I especially like the Acclimation feature. It kinda sucks to have to buy additional equipment (Reef Link) or usb to a puter to set the lights. But it's not a deal breaker in my opinion. The Reefbreeders would put out some crazy par and adjustable color channels, but had some noticeable hot spots when checking with a Par Meter. These lights spread the light out much better and seem to be very stable from an operations point of view. Disco effect is minimal.