wayne123456,
I just went through some research on this as well, and I was ready to buy the Honda units. Upon research, the Yamaha units seem to be equally as popular, with a few features the Honda doesn't have (fuel gauge and fuel shut-off petcock).
Then, I stumbled upon someone who recommended this
Smarter Tools unit which uses the same Yamaha engine, has the fuel gauge & fuel shut-off. Costco.com has this unit for $599.99. So, I bought two of them and they just came in this week. I'll be firing them up this weekend. The cable to combine them was $59.99 (also from Costco.com).
By the way, the only real complaints I heard of people about the Yamaha engine based generators is that there are not as many generator service facilities around. I guess that's something that's hard to put a value on, but considering I do my own servicing, it wasn't enough to sway my opinion. And I'm a long time Honda fan.
I'll be testing them out this week. The great thing is if they don't seem to live up to expectations, I'll just bring them back to my local Costco.
Just something else to throw in the mix for you to mull over. :)
~Rick