I've never had my sunbrites come on full blast after unplugging them. Mine go straight back into the program cycle.
I can't say anything about the noise on the fan, as I've never listened for it. I can say for sure its not louder than the rest of the equipment on my tank.
As far as coverage goes, my 6' 125Gal is covered from corner to corner, with quite a bit of light leaking on the front and back of the tank. I am currently working on a 7' X 24" x 30" tank, and I plan on using my 72" fixture as the only lighting. I'm fairly confident it will be more than enough. Because of where my rocks and coral will be placed, im not too concerned about the corners of the tank being a little dimmer.
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