Ok guys I used the 6t this weekend and I am not happy with it.The first site I took it to is an old homesite late 1800's I assume.Lots of iron,every other rock in the foundation stones is a hot rock,and there are veins of some type of stone/ore in several places around the house.I have been plauged by this ore before so saturday I put a magnet to it and it is magnetic in certain places.The 6t overloads on hot rocks,It hits hard on the ore before you dig it then the smaller pieces disc out and the larger pieces overload it.I think it has 8 or 9 tones and I disc out the first two which are big iron and nails,so that leaves 6 or 7 tones.The thing sounds like a carnival when you swing it,it hits one sided signals non stop,non repetable high tones all day.Vdi numbers are constantly bouncing from -95 to +95,iron the size of a can top will overload it. It took me all day to get used to the constant noise and no good targets.When it repeats the signal there is something in the ground for sure the pinpoint works good,the depth is accurate on coin sizes.I think the auto tracking feature works against you in high trash,I got better stability by locking it in an area that was clean and then going to the search area.Next day I took it to the city,6t doesnt like the city either.The machine never shut up all day I refuse to lower the sensitivity to less than half and everywhere I tried it ,it was about the same. it would just sit and make tones and count off random vdi numbers while it laid on the ground when I was digging.One up side to the city I found a 1918 mercury dime at about 8 inches, and a wheat cent,and a handful of zinc pennies.But it was the same business non repeatable high tones all day.So to summarize,I bought a 600 dollar detector with vdi,lcd display,multi tones,led bargraph,bells, whistles,and whatever else and I am using it like a 200 dollar tesoro that has a speaker and not much else.Iron and minerals,poor ground conditions beat the wheels off of this 6t. I'm over it,I am going to use it because I bought it but starting tonight I am going to do some hardcore research for my next purchase.I would like your opinions on the all time greatest detectors,not just what is in stores now,I mean the best of all time.What do you use and wouldn't sell for anything?