I have the Coralife Aqualite Pro 48" model on my 75G tank. It has two 175W DE MH, 2 96W Actinic PCs, and 3 LEDs. I kinda splurged on the unit, but now I'm gald that I did. I've been very pleased with the unit so far. Here's abrief summary of my experience, in case it helps you decide...
There are 4 power switches -- one for each MH, one for the the PCs, and one for the LEDs. This lets you run each light on a separate timer to create a 24 hour light cycle. It also has an integrated cooling fan that blows directly up from the middle of the unit. It switches on when the MHs come on. I cut a hole in the top of my cabinet right above the cooling fan and mounted another cooling fan there to allow the heat to escape. I have the cooling fan connected to the same timer that controlls the MHs, so when they come on, my extra cooling fan also comes on. So far the heat build-up has not been too bad, the max water temp I have seen is 82F, but it is winter now. Hopefully things won't get too hot in the summer.
The only gripe I have is that the power cords are really freakin long. My tank is in a custom-built cabinet, and I had electrical outlets installed above the tank location for the ligths. So, I have 10 feet of cord where 1 to 2 feet would do. Unfortunately, the cords do not disconnect from the unit (in which case I could replace them with shorter cables), so I have to live with bunched-up cords everywhere.
The unit comes with 4 attachable feet, which position the lights about 8 inches above the water. When I was first getting ready to install the lights, I had already attached the legs and had put the lights on the floor while I did some work in the cabinet. I looked back a few minutes later to see my 2 year old standing on the lights. 8O One of the legs broke, but other than that the lights still work fine. So, they're well made.
Overall, I think the Aqualite product is very nice and I highly recommend it.