I have one and there's a guy in our group who will always ask me if I'd bring it for him to use. Serves as a backup that way, too. Simple, compact, lightweight, forever battery life. Best part is the top-mounted display, vs the side view on a similar device from Vexilar. I do get annoyed by how loud it is - transducer ticking seems much louder than others, and there's a depth and/or fish alarm that doesn't seem to have a way to silence. Turns itself off a little too quickly, also. Yours looks like a newer model; maybe those behaviors have been improved upon.
Here, I show it shooting through a ziploc-type sandwich bag filled with a little water and no air bubbles. Looks like I propped it up a bit with a day pack to keep it upright along the edge of the hull to avoid the floatation foam.