Yes, they were pricey - but IMO well worth the investment.
-NO heat transferred to the tank
-NO bulbs to replace (for about 13 years)
-Less than 1/2 the electricity (and they are PAR MONSTERS - 140 Watts of LEDS provides more PAR than 400+ watts of MH)
-A built in ramping controller that allows for custom sunrise/sunsets and mid-day PAR increases.
I'm a huge proponent of LEDS - I even run an Evil PAR 38 21W 12K LED bulb in my sump (a while back I set up a test frag tank in the center sump section - 21 watts did great job of growing SPS.)
I believe LEDS will completely replace MH as the acquisition costs fall. If your handy, there are lots of DIY options that cost a fraction of the AI's (but you lose the controller.)
Do you have the new ones with XP-Gs? I'm trying to figure out the XPG count for my build. Thinking 13 with 23 Royal Blue XR-Es at the moment. This one will have 13 degree lenses and hang 30" above the top of the tank. I suppose it's apples ot oranges then.
I've got a Reefkeeper Elite with the ALC module for the controller.