Thermoking C600

Hello,
Is anybody had Thermoking Precedent C600? We have on a company Thermoking SB210 and 230. They are all good units but the last 2-3 years we bought all Carriers 7300 and 7500. They are great units also but little bit noisy. But never gave us an hard time.
Right now on a market again and the dealer offering us a C600. they saying these are good units also but I heard they giving hard time. Break down often. Has anyone had experience like that.
Thank you