One of the things I like most about VLF's is their target ID's.  I'm amazed with detectors being able to ID targets.  Where I hunt I prefer to dig as few holes as possible so I heavily rely on Target ID's.  My front yard is the most difficult place around my area for coin's to ID well, it has the EMI of my house nearby, the worst seems to come from my long range wireless router, I'm also abut 100 meters away from some high voltage power lines that carry power from the nearby windmills to the tow