UK Brian,
Not every person on the beach metal detects. At least not her in the U.S. And of the people that do detect on the beach, not all of them use the Excalibur. So if you are finding coins whenever you come to this side of the pond, great! More power to you.
Most of the Excalibur users, after they learned their machine, will do fine. It is not absolutely necessary to change out the headphones or the coil. Some prefer the way they come, and others may decide to change only the coil, and others may only want to change the headphones. There are even still others that don't use the Excalibur.
As I was saying about Excalibur users learning their machines. There is no need to dig every little null, but checking them to make sure they are true nulls causes for less frustration digging up iron. That is a plus. It seems that the machine may not have had any changes made to it since its conception, but are you sure about that? Maybe something was changed. Maybe you are right and nothing has been changed. If nothing has changed, doesn't that prove the design is good?
People say the Excalibur is the same as the Sovereigns. I think it lies in only a few of the key components, but I don't think they are the same machine. They may act similar, but packaged completely different. One difference I can name for sure is very petty, but might be a real difference. The Sovereign has a foil wrap around the electronics to help aid against interference. The Excalibur doesn't have that.
Some other people say the Fisher 1280X and the HeadHunter Wader/Diver are of the same design. Maybe they are, but some prefer one over the other and not because of the weight.
Bottom line is that the people who like the Excalibur machine itself, like it because it works very well. If you don't like it because Minelab didn't put out a press report about any changes made to it from the beginning, then don't use it.
Be sure to continue digging deep for little pieces of rusted iron your pulse machine finds for you and put them in your pouch, as us Excalibur users will probably pass on those.
Thank you for your time.
ed