Interesting observations. I would estimate I have hunted around 720 hours with my new E-Trac this year. I don't have my numbers handy, but seems like I may be detecting a little differently than you guys? I am still 90% park and schoolyard hunting, but I have well over 1000 wheat cents (32 indian heads) and nearly 300 silver coins including 12 silver halves. My clad totals (I have these jotted down at home by denomination) are around $320 for the year. I'll be interested to check my percentages and see how they line up. I also do not dig shallow perfect zinc signals, but also base that decision on the site. At one park I picked up a 1907 Indian head that was laying on top of the ground, it had been "washed out" next to a stone pillar, so you never know.