The first thing I noticed when I visited that site is that the...

The first thing I noticed when I visited that site is that the owner hates Minelab almost as much as you do. I also noticed that no one owns a GPZ which means all reports are like yours, just hearsay.
You say Whites has a competitive detector but that's hard to believe going by their patents.
You say the Minelab GB patents have now expired and it's now open slather but that version of MPS is now old hat and not competitive without a method equivalent to the smooth, new salt and fine gold timings. Garret tried a version of ML's MPS in their ATX and where did that get them?
You say the ferrite video proves the ZED GB is flawed but the ferrite core was introduced because some "professionals" couldn't follow the instructions, whereas most novices caught on almost immediately. The original testers followed the instructions and had no problems. The software upgrade was always going to happen.
I recently bought a coil from a happy ZED owner who showed me well over $150,000 worth of gold he's recovered so far from previously worked ground in Victoria and he's not the only one. I don't think you want the share price to drop, more likely there's a reason why you don't want people to buy a ZED. You seem to think the GPXs are okay though?

You managed to get the fall in the share price right but you have been wrong with everything else re metal detectors so far. The ZED technology has some very obvious advantages over traditional pulse induction and the fact that you haven't mentioned any of these advantages speaks volumes about your knowledge, or lack of.