Ed,
The 535 is a good basic sonar unit. We have not made them since the 2009 model year though so its almost two years out of production but we warranty from the date of purchase so keep your receipt just in case you need it. We make more feature laden basic units now so you may opt to hold off and put a few more dollars with it and get more band for your buck. The 500 series units, 535 among them, all get produced on the same manufacturing lines as the more expensive units and have to meet the same tests as well, so its not like it is a second class unit