I found a local person selling a humminbird LCR 4x6 in the box for a really good price it seems. Is this any good? Can somebody tell me a little about it with the goods and the bads before I go ahead an perchase it. I currently have a bird 560 and I am not overly impressed with it, although its ok for the price. I am looking to upgrade a little. I can't seem to find much info on the net about the LCR 4x6. It's not a model they make any more obviously.