6 years and (one battery change) going strong, amazing.. Not only depth but the fish scan mode is a key feature too. It automatically goes in to scan after it displays the depth and will let you know audibly and flash what depth the highest fish is in the cone return signal. I found a filthy thick pile of crappies in a deep basin 29' suspended up to 19' off. Also on a
bluegill search in 9' of water we found em in a back bay area using a travel lane in 6.5' Pretty neat deal down to 1/10th of an inch.
When the ice is dry on top I carry a self-ignition plumbers torch. I also put a layer of 3m duct tape over the entire battery compartment to provide a extra layer of protection. I have gotten my money's worth out of it.