I went with this unit and love it. Get the ram mounts and adjust the screen so it points right at ya eyeballs. Also, record everything when you first start using it and compare what you see on screen with humviewer. It'll train you to notice those little blobs of fish out there on the sides of your boat.

Its easy to see the fish below you in the water column, but it takes a while to notice them on the sides while dealing with all the other issues of fishing. But in time, you'll see a splotch and recognize it for a school of fish, motor around a catch a couple.... at least I have.

They aint lyin. These side units will change the way you fish. I catch where they ain't sposed to be and don't see any where they are.