I have one of the old ones as well. I can tell you that is not in the boat now. However, when I was using it I believe that it worked at least I think it did. I went fishing with a buddy several years ago and he was telling me how a certian color was killing the fish. The color c-lector said to use a different color. I was kicking his bu** until he changed to the other color. Then later in the day the sun came out and the catching slowed down. The color c-lector had changed to the color he started out with. We both changed and the fishing improved greatly. So, does it work - probably. Do I still use - no, but probably should. As mandingo said it is all based on the light penetration and clarity of the water.