Oh man, what a great machine!
Even better if it's got Powermaster! 20% deeper! No joke! Great machine! It's like a step up from the old GTA 1000. In fact, I don't even know why Garrett calls it a Master Hunter because it's not like any of the other Master Hunter series It's more like a GTA. It doesn't have the dual range discrimination feature like the other Master Hunters. It is a great machine with some very good features, though. I've still got my old one. It does stay in storage most of the time, 'cause my wife and I are full time RVers and need to travel lite. I do break it out every now and again and swing it around. Perhaps my favorite feature on it is the true all metal mode with manual or auto ground balance. It takes any of the old Crossfire coils as well as the GTA 10"x14" double "D". It can also use that two-box Treasure Hound for cache hunting/very deep larger items. If I were you I'd jump on it, man. Did I mention that it's a really great machine?
Hey, here's some useful links:
Lost Treasure Magazine field test by Andy Sabisch from '92:
http://www.losttreasure.com/node/5399
Lost Treasure Magazine field test by Andy Sabisch from '96:
http://www.losttreasure.com/node/1060
Instructional video:
http://www.youtube.com/watch?v=OtQVIRE4T4I
Owners manual:
http://www.garrett.com/hobby/manuals2/Grand-Master-Hunter-CX-lll.pdf
Best of luck to ya'
Happy Hunting!