The widescan coils are just fun to search with because of the wide search signal pattern that is shaped like a knife going down the center of the coil.The concentric coils get the max depth but you can easily miss targets because the far end of the signal is shaped like a point,only covering at depth at a very small area.This is why even though i have neutral soil that i prefer to just hunt with widescan coils not unless i want to search a small area for a very deep coin or relic.The widescan just feels good on the detector because you feel like you are covering the ground in a efficient manner.The concentric just feels like you are looking for a needle in a hay stack.The widescan will also slice in between trash because of the signal pattern.I pulled a colonial coin out of a trashy school ground that was built over a colonial site with a 10x5 elliptical tesoro coil hooked to the tejon.This coil is one of the best tesoro coils i have ever used.Works great on the vaq also.The 10x5 is the most versatile coil.A solid coil will not get hung in the woods like a open coil,you can keep it closer to the ground and the way it is shaped it will work around trees,rocks,foundations so easily.Anyone with a vaq or tejon,i would suggest the coil.