I've had my Garrett GTI 2500 about a year, I tuly enjoy using it. My wife and I have been MDing since 1973, I love my GTI 2500, I bought her an upgrade, got her an Garrett AT Pro which she loves as well. The GTI I use, gets small items deep, Wheats, Silver Dimes a good 6-8 inches down, same with quarters, Silver Quarters, at 6-8 inches down, have gone as far as 10 inches on a Silver Quarter. Picked up a nice Silver Ring with a big Jade Stone at 6 inches last week. I've learned not to go too high on the Sensitivity. The best for you to do, learn your tones with your ears....When not sure, dig it, I call those my educational digs, I'm learning by digging things I question, they are your teachers, the unknowns, then become the Knowns to you.....Then you'll get to a point where you'll challenge yourself and guess what it is prior to going in for the dig, you be pleased to see you were right.....I find on my GTI that if I get a reading at 3.5 in the upper scale with a swing of the disk left and right, and the 3.5 scale stays the same, it's often a ring....Pull Tabs 90% of the time are at 4 on the upper scale, some trash has fooled me, reading at 3.5, but not often...Practice, Practice,Practice.....Use your Headsets as well....