As one of t he original purchasers of an IQ2000 I can tell you first hand that there is no noticeable difference in noise level of these to a Honda. What I can tell you is that the amount of power produced is substantially higher in the Honda's over the Generac's! I did extensive testing with multiple IQ2K's and never could get any of them to produce enough power to compete with the Honda. I sent a total of 4 back to the company because they are worthless and purchased 2 Honda EU2000's and have never looked back!
I tried them, they failed miserably and now I have unit's that work
Chris