I absolutely love my LEDs, the 1st generation of Ecoxotic panoramas. Had them for quite a while and all my corals are thriving. I have a little of everything, sps included. Some of the major benefits I've experienced are-
No chiller needed anymore, way less heat than my old t5s, in fact, no heat transfer anymore.
Amazing shimmer effect, which I've read actually multiplies the light many times for an instant (same as halides).
Easy do it yourself with panoramas.
For me, a major increase in coralline algae growth.
Natural look
Less nuisance algae growth.
Less electricity
Sps seem to grow faster under them, but I think it's because of the 8000k whites on the 8000k / 453 combo. My old setup was t5 Ho with 12000k /460 bulbs.
There are a few other benefits but its hard to type on my phone keyboard. By the way my tank is a 90 gallon tall, 48" wide, 24 tall, and 18 (front to back). I finally ended up with 9 panoramas. Only drawback is price, but once you buy, your done. No bulbs to replace. They do have a newer higher watt version of the panoramas now too.
www.ecoxotic.com