I've been running SL since it gives a serious depth increase at lower thresholds while being more quiet than positive threshold in DE. I'm generally about -2 and 50-75 sensitivity. This is the fourth silver (2 rings, 2 coins) on the same set of batteries. Was in a heavily hunted courthouse lawn. I've personally witnessed a Detech Ultimate 13 on a V3i go over this very spot. SL is not supposed to give as good of separation as DE but there was trash all over this coin. It sounded super solid and gave a consistent 85-90 VDI. I was pretty certain it was silver before I dug it.