Last February I bought a 3100i factory refurbished from http://www.supergenproducts.com/
. Great unit and fast shipping. They are a factory authorized service center. The generator is like new condition and runs great. Price was $599 and has 90 day warranty. All parts are available also. Son is running GNCC atv series and use it to power a 26RR without issue. Just need to be sensible about powering multiple things when ac is running. We have run this unit nonstop from Friday to Sunday with no problems. Just my 2cents.