I can reply to that as you can see in my signature I have the older open style and 2 of the newer Champions. Yes the open one is a lot noisier but for the price I paid many years ago and what it does we still use it out boondocking in the bush. Runs everything but does take 2 of us to take it out of the truck and we just run a long cable back to the trailer. I also have 2 of the newer 2k inverter models too. They work very well for us to run the toaster, coffee pot, OIC stove top and charge batteries etc. Very quiet just like the Honda as well. Keep in mind they only really have a max continuous wattage of 1600 and a complaint from many has been it is not even close to the 2k that they advertise in big print but what it says in small. Link 2 together and you have lots of power. I usually only take one of them most of the time as in the mountains we don't need the ac so it is more for the small appliances and charging and works great for that. Very quiet too and if I leave it in the back of the truck you almost can't hear it running inside so grat for rainy days watching movies too and doesn't bother others. Picked mine up at Costco a few years back on a great deal they had them on for 399 so made sense to go that route form me. The Honda's are great units too but up here they run a lot more than in the U.S. so I decided to go the Champion route and love them.
Feel free to pm me if you have any questions you would prefer to answer offline.