My buddy "Gordy Gordon" on ifish has one of these.
We've tested it against my humminbird Matrix 27 and the depth readings are right on....the "fish detection" well, I don't believe it for a second! It was showing fish all over the place, but the matrix only marked one.
I'm new to these fish finders. Does Gain control something that must be preset or can the unit be taken apart and adjusted somehow? I notice gain control is only available on the more expensive fish finders.