I just got my coil in the mail today from Bart at Big Boys Hobbies Metal Detectors - great deal and GREAT service! I'm going to try to sneak off this afternoon with it to some super trashy older sites and see what happens. I have not installed the update on my Equinox 600 - does it help the 600 much? I have seen some folks had a problem with it changing readings etc. and just want to know if it is worth the hassle to do it (I know - no big hassle to install it, but maybe a hassle to undo it).