my opinion is that MH lights are just the best, no other light comes close to the beauty. I've been an MH user for about 15 years, will never change. I don't know about the system you mention, but I've never had heat problems with my system, I think the heat concerns are overhyped
This may be true - however in my case my wife wants to something specific - which is different colorations, or ability to adjust the lights (think overcast, more blue, lunar cycles etc). She's not really objecting to this very expensive project, so the least I can do is try to make that happen for her
However the heat still does concern me. I dont live in a cool climate, and I dont want to get a chiller.