Over the weekend I had the opportunity to try the CTX at difficult site ..The site is a one block square vacant lot that was one a track for a old school.. The track area around the onside is thick cinders and the inner area has cinders as well in the soil.. When you stick your digger in you can feel the crunchy/gritty feeling .. Ive tried all of my old detectors and all got about the same depth, about 2-3".. I was eager to try the manual ground balance and see if it helped out.. To make a long story short, the the manual ground balance had little effect but switching to the ground coin mode made a big difference ..I can now get 5-6" at this site.. A isolated thunderstorm isolated itself right over head and keep chasing me under a tree so I loaded up and headed to my final destination but am looking forward to returning to see what Ive been missing all these years...wildherre