I've owned the F75 a little over a week now and love this machine. It's so fast, picks through the iron good and has amazing depth on small targets. The bullets were in the 9"-10" range with the small pistol balls banging at 7-8" and the tiny percussion caps sounding loud and clear at 5-6" range. I have read NASA Tom's suggestions and love the monotone settings with Sens. at 91-99 and disc. at 4-6. This makes for one hot detector and I'm just getting started. I have used the motion all metal and wait and hunt with the indicator but it gets a bit un-nerving after awhile. Overall a terrific machine.