Ive noticed a few discussions around the forums / farcebook etc where some people compare the GM to a GPX & seem to overlook the fundamental difference in that the GM is a wideband VLF.
I haven't had mine very long, & not found gold with it yet, but in practising with it on test pieces Im learning the noises it makes, starting to ignore the screen indicator, & I quiet like the little beast, & its not too bad as a coin/relic hunter in low trash areas, although I prefer my XT for that.... An EQ600/800 is on the wishlist ... oneday