Hello Tony,
I've read good reviews on the XP G-MAXX 2, never owned one but have owned the XP Gold Maxx Power.
The XP G-MAXX 2 is 4.6 kHz, The XP Gold MAXX Power is 18 kHz. Both excellent detectors and mainly used across the pond, for my type of hunting prefer the XP Gold Maxx Power because of the 18 kHz for smaller thinner coins such as tiny worn reales and 1/2 dimes. Auctally, My first outing with the XP Gold Maxx power El and I hunt turned up an 1849 1/2 dime followed with a reale on the second hunt same site. El was there when the reale surfaced, the 1/2 dime was two weeks earlier.
Keith Southern may have owned an XP G-MAXX 2, Tom from back east had one I believe. Both are terrific detectors, but I favor having an edge on smaller silver rather than depth. XP Gold Maxx Power is pretty deep, especially with a slight negative GB boy is it deep.
You can purchase one from across the pond, that's were I found mine. From a dealer, think it was Gary. Sold my unit last year. Tones are great, extremely sensitive to small targets.
Good luck, keep us posted if you find one.
Paul