I'm not singling out the XP or any other machine (The XP is probably the most advanced along with a CTX with GPS) but from my perspective, Metal detecting is still stuck in the old days when Radio Shack was the place you went to buy a computer (TRS-80). Sure those days were fun and exciting,but the technology has surpassed even the wildest dreams of anyone who remembers a 360K floppy disc.. With everything that is available technology wise, I think it's sad that none of the manufacturers are taking advantage of the availability of the Internet to teach (aftermarket providers as well) and inform. Not to mention improving the machines themselves. I, like many others, rely on information portals like Youtube (Youtube University) to learn about many different types of complex technologies from Electronics to CNC machining, there is someone, somewhere making a video about it. Not so much in the Metal Detecting arena. (Yes, there are some, but with the amount of people involved in this activity, I would think that more in depth video's would be available.
Also, the cost of making a DVD is MINUSCULE compared to what it was 10 years ago. I remember paying $10.00 PER DISC and thousands of dollars for the Video Programs to edit and convert the footage from VHS decks...Now, you can edit a video from your smart phone that looks every bit as good as commercial productions. Go pros can video in 4k for crying out loud!
I'm sure that owners of various machines would be MORE THAN WILLING to shell out $50.00 for a DVD that took the machine down to the fundamentals. Ground differences can be dealt with easily. DVD's can have chapters from simple to complex. Even a series would be a good thing.
Just my thoughts.