I've used the Honda 2000i, the Honeywell 2000 and this
http://www.harborfreight.com/800-rat...tor-66619.html All beside each other. The honda was barely quieter than the other 2 but was 3 times the price of the honeywell and 10 times more than the harborfreight one.
To be honest, at $100 for the harborfreight generator, if it was at the far end of my 12 foot trailer, you could barely hear it running. If it was at the front bumper of the truck and you were at the back of the trailer it wasn't even noticeable that it was running with normal RC airplane noise. I ran it for about 5 hours a day for 2 days and it may have used 1/3 a gallon of fuel. For the price, it is definitely the best bang for your buck generator.