I own the champion 3100I. i picked it up at costco about a year ago for sale at $599. i had been looking and thought it was too good of a deal to pass up. I have a 2015 four wind class c with 15,000 btu a/c and the generator handles it with no problem. i have not tried running the microwave and a/c together but it runs the a/c with juice to spare.
My motorhome has the onan 4000 generator but i have the Champion for other needs but it is nice to be able to pull it away from the motorhome and run it. i find its quieter then the onan.