Yes you can stack the champion, and buy the additional parallel power kit and get 1 - 120V Twistlock Receptacle (L5-30R) and 1- RV Receptacle (TT-30R) for 3600 watts. I only have one, so I cannot comment on how well it works. There are a ton of YouTube videos. Here is one running both.https://www.youtube.com/watch?v=c4lrPJ18k3s. If you were to say the Honda is better I would say your probably right but I would also say its not 450 dollars better, and I think I paid less then that from Costco wish I got 2. Mine is quite. I had it out back during a power outage to keep my fridge cool and some lights on, my neighbors stated they did not hear it from inside there house during the evenening. As for longevity I have had mine for about 3 years. I cant say I use it much, but when I need it, it works for me. Heck, with the simple instructions on the generator my wife was even able to run it.