I just put mine on in Sept. Before that I have only had the cheap eagle brands(fisheasy II) but I got great use out of those for many years. I wanted a color graph and a GPS so I bought the 642C and I love it. Less expensive than the lowrance and humminbirds models but still a quality product. I also added the hot maps card and it shows much greater detail on the lakes I fish. I love mine and have had no problems.