Jonathan, The majority of us very much appreciate your real world evaluations of Minelab products and your willingness to share your insights. Based upon my prior GP ownership experiences, I have absolute faith that each new GP series detector will have improvements and refinements that make it worthy of the upgrade. My 4500 was on order and my 4000 sold the instant I heard of the impending release. My 4000 was such a tremendous improvement over my 3500 for the conditions in which I detect that I cannot wait to see what the 4500 can do! Thanks again! As for those that would continue to whine and complain like little girls with every new release of a new GP series unit, I have to say "get over it"! Minelab appears to release something new every 18 months like clockwork. Hell, I even put it on my calendar now and plan for it. If you don't like how Minelab does business, buy something else. I'll be out there finding the gold you couldn't even hear with old or poorly designed technology and it's getting tougher every day!