I have had the si unit for over two years and my boss is a die hard Lowrance man. I believe the Lowrance is a fine piece of equipment and I have talked to several people that have them. So with that said, I must agree with most of the feedback you have so far. I know that Hummingbird is much easier to get support from. Last summer I watched my boss almost stroke out dealing with Lowrance customer support. He now owns a Hummingbird.