As for being loud, Listen , the only reason we are using these generators, is because we have no power. This is a BIG problem for us in this hobby. Not only for our tanks, but also for people who like to live normally when we have no power.
I couldn't give a crap if someone thinks my generator is too loud, I have a 15kw with tons a propane to run it, At least I know I'll be comfortable and my tank will still be running, The ones who usally complain, are the ones who are trying to sleep with their windows open, because they don't have one.,
Save your money and stick with a generator that is a little louder, and when the power comes back on, take the money you saved and buy more corals and fish!