Mike,
I more the less stayed in a small area at that site but within my small area I checked the GB a few times and had to adjust it twice to keep it on a slightly positive setting. But within the area I was in, the soil is visibly different there. They done some grading work on the side of the hill one time and the ground is more of a reddish clay there than what the rest of the site is. That ground is really rocky. Other than a CoinStrike, and EX II, the X-Terra is the only other ID machine to really do any good there. The guy with the EX II had to run it in all metal though.
To me...the X-Terra 50 is A LOT like the CoinStrike. I call it "a CoinStrike on a diet". It gets about the same depth but there is a lot of differences between the two too. Good difference...as in enough that I am trying to sell my C$ to get a X-Terra 50. It's lighter, the menu screen changes are easier to make, and it has more discrimination adjustments. And the ID doesn't jump around as much. I like all of that.