Hi, I am using Bennington C600. So far coming to 4th week since I have moved in. It's a good heater. Does its job perfectly. Wife is also apply with it. Just that it will take a few seconds before the hot water reaches you. But I feel this only cos, my mom's place was instant heater on both bathrooms. For my wife who is used to water tank heater, she says that this is better than her mom's place. Do visit their warehouse at ang mo kio, to know more of the product. As you might have heared that this kind of heaters would not be so effective, only when you try out their demonstration you would be able to understand the full use and pros about this Bennington C600. Overall, a happy user.