I have had my Garmin 400C now for over twelve months and found it a great tool to use.Easy to work through the screens, ample power output with dual frequency,easy viewing screen in sunlight with a small screen ,Good interpretation of bottom density and fish readings. I have used it to 50 M depths without any hassles. Recommended at the right price, Iwas lucky to pick mine up from US when the dollar was good.
Regards Pete.