The previous review on this generator is correct. It is quiet and it is a very good gas saver. We use our generator for a 250 watt average load. With that load, the economy saver feature on this generator allows its 0.6 gallon tank to last a little over 12 hours!!
It is extremely quiet, just slightly louder than that of a good refridgerator.
Why the 4-star rating?
The Yamaha website doesn't appear to be too up-to-date on Yamaha Generator Service Shops. When we got our generator, it had a bad seal on it and the oil leaked out. When we looked on the Yamaha website, it showed two dealers in our area that fixed these generators. Neither one would take it. They said they stopped working on generators. I ended up having to drive over to the next town where the dealer told me that most dealers do not like to take generators unless they sold it to you themselves.
So, while I got lucky and found someone that would take it. Just be aware that you might not be so lucky. Before buying, call the dealers on the Yamaha website and ask them if they can fix a generator for you. Then you will have a better idea of what situation you are in before you buy.