Hey crazyman, sorry for the delay - I just got back in town after being away for the weekend...
Well, as I've said above, my overall experience with the XS-2 PRO has been great. I was able to find stuff shortly after swinging it, and then only minimally having to adjust anything. I was finding coins at twice the depth of my first detector, the Bounty Hunter Land Star. Then I got the GT and headed in the same vicinity. Man, this thing was going crazy. It was nulling almost with every swing (iron) and now and then you could hear a chirp but when I went back to it only nulling was present. Occasionally I would get signals for other metals like alum. I begun adjusting everything and with increased Disc and lowered Sens the machine calmed down a bit, but then I was thinking what I'm missing out on. Feeling like I haven't done my homework on all the adjustments this machine has (and I admit I have not, I expected it to be like the XS-2 pro) I called it a day since it was getting dark out too. After about 40 minutes of this frustrating stuff, I came away with 3 pull tabs, 1 gum wrapper, 1 penny which was nearly at the surface, a toy car axle with one wheel still attached to it, 1 nail and 2 bottle caps (i decided to dig the little cirps at the end of nulling, just to make sure i'm not missing something. the cirps did not repeat after swinging over the area again, but dug anyway. I think I swung too fast the first time)
Haven't had time to go back; after that first experience I felt like I would need a handful of hours just to learn every option on this unit. But I did email a friend (fellow GT user that I met online, and is also a member here) and after explaining what happened he said the place is just very very trashy and I would need to use a small coil. That immediately made sense. But why was I able to comb this area just fine with the XS and same wot? This GT is either more sensitive or I did not properly know how to adjust everything.
Anyway, this was my experience so far with the upgrade from XS-2 PRO to GT. I don't mean to hijack this thread, but any thoughts from experts like you, critterhunter, ron... etc. would be appreciated.