Agree there is a lot of info out there. Everyone was very helpful on my search a couple of years back. Settled on a Pirahnaxmax 210. Very lightweight, easy on the batteries, and easy to use. Didn't shoot through the hull, Kevlar, but didn't have much trouble keeping the suction cup attached to the side of the canoe. Vaseline applied to the suction cup tip provided on this sight very helpful. Just a gurgle here and there as we trolled the shorelines.