It depends on several things, but the other thing that I try to encourage people to do is to learn how slow you can go and still get a good target response. It's different for everyone, each in their own set of circumstances. I've got places where trash is heavy and mineralization is high, and I go snail slow, probably not much faster than 1ft/sec, but other places where depth isn't an issue or where soil conditions are lighter where I can about triple that.
I'm convinced that a lot of the successes that Minelab owners enjoy is due to how slow they can go and still get a good lock on a target. A machine that requires a faster sweep speed is more likely to skip over a good target due to masking or depth. You often hear owners of other brands talking about stability issues because they don't want to sacrifice depth by lowering sensitivity, but you won't hear much of that here because it isn't a problem with Minelabs due to their NC capability and the fact that they can go slow. So sorting through trash is far less mentally taxing, and much more rewarding.
