Why are you planning to sell your ExpII?
You have a top of the line machine that WORKS.
The ExpII has a great reputation for continually finding thing in "hunted out" areas. As other have discussed, there are many top of the line machines that also find things in "hunted out areas", but a certain amount of this is because not every square inch is swept no matter how hard we try. So yes, a certain amount of this ExpII success can be assigned to just having been the first to sweep a particular square inch with a deep machine, but there is no lack of success stories with the ExpII.
Certainly the ExpII offers a wide range of configurability, for many this can be a source of never-ending (or so it would seem) confusion. As always, the best advice is to pick a site, pick a suitable setting, and to go slow and find stuff.
You are in charge of finding sites, whether that be on your own, or with another experienced hunter or group, no matter what machine they might use.
As for settings, that's where this site comes in. Let us know what you are finding, and let us know what OTHERS are finding in that same area. C.C., Deep South, and a host of other folks with real ground-pounding experience can help get you started with proven settings. In a post below, Deep South reprinted some configuration notes from Mike Moutray. Mike (and folks already mentioned) are hardcore hunters, and their setting are likely to provide the best possible depth and get the best possible results from your machine.
If the sites you hunt are hopoelessly confused with trash, perhaps a smaller coil is in order. If you are having second thoughts about your detector the last thing you might want to hear is to spend more money. I understand that, but again, if trash is a problem you have few choices. Dig the iffy signals until you learn what the machine is "seeing", and develop a mental catalog of what these iffy signals relate to. If you have a useless jumble of junk signals where you get multiple hits in each square foot, you can either dig to learn, or try and find less trash filled areas until you and your machine are working as a team.
Perhaps key is ground time. You can talk about junk signals, junk signals with goodies close by, good signals that seem iffy due to depth, and great textbook clean signals all day, but if you aren't out in the fields and parks swinging the coil, it will have been little more than discussion, no matter how you look at it.
You have people here that can help, and 100% of us are interested in helping. Those who post on this page are either here to help, or in need of same. You might not have liked the way certain situations were handled, and I understand that. I made it past a big stage myself after having been accused of being part of the problem, now I'm hell bent on being part of the solution.
So, explain why you are getting rid of your top of the line ExpII. If your goal is to get a lighter more user friendly unit I understand that too, but hate to see you take a significant loss when so far as we know right now, your ExpII is in working order.
Regards,
DAS