I bought a 3100 gas only, champion for two reasons, One the Price from Costco shipped to my house for $700, you don't even have to be a Costco member to buy.. Also I live in LA area and when I need Service, Champion is close buy and I can bring it for service, Wich I needed actually... After 125 hours, the Carb needed to be replaced as there is a electric motor on it that controls the throttle burned out.. I brought it in to champion, no Appointment, and the Service guy stopped working on his jobs, and took the 1 1/2 hours needed to take it all apart and fix it.. WOW what a job to take apart..not easy. He replaced the recoil rope for free, new air filter and gave me an extra spark Plug too.. Total cost was about $130 for the new Carb assembly installed.. BTW the Carb is not covered under the 3 year warranty.....