Are you looking for a unit that give high tones for coins? I too have the 3D and love it. I have read posts that some dont like the 3D and some do,thats why you have a choice. When I seen the Edge had OC I thought it would read coins in the high tone, After looking in the man it shows you what numbers on each mode. I am not sure where this thing is going from what I have read on this post. It looks as if there is going to be a mid line of unit out there to choose from. Everything is getting smaller and lower in price, so maybe its not a midline unit after all.