@Mark911 has the Q6500. There is an issue he has had with having it tripping the GFCI if I remember correctly. I’m sure he will give you the lowdown on it.
The B&S Q6500 is working fine. In my mind it's the best alternative to the $4k plus Yamaha and Honda 240 inverters. It was NOT as quiet as advertised. In fact, I was quite displeased and ready to return it as it wasn't much better than my $400 commercial unit. However, being fully enclosed it had the potential to be quiet. I bought some high temp sound deading material from McMaster Carr and basically wrapped it from the inside. Man, what a difference. Now it's just as good as the expensive Honda/Yama. It's got an "eco" mode which throttles down the rpm to just enough to supply the requested current and it really helps with the sound as well.
I also got a VERY good look into the design and quality of the generator as I needed to essentially strip it down. The hard part mechanicals are pretty good but the plastic parts are flimsy and not very well attached, more slots/tabs than solid bolts/screws. Better for fast manufacturing but not for being banged around in the back of a pickup. Time will tell.
Even without a electric start the weight is still too much to lift by myself so I use my bike ramps. I wish it had some lift handles to make the job easier and I'll be adding some soon.
If you live in Ca you'll need to buy it out of state as it's not CARB compliant (no evap system, etc).
By this time I'd expect the prices to be around $1500, less than half the big Honda and Yamaha inverters. Bottom line, if sound is important and your willing to spend an extra $100 and a day insulating the generator the B&S is a cost effective alternate to the big boys.