The Pawnshop in my town has a Pioneer 505 with 8 inch and 4 inch coil. I think that they want about $180 for it. Does anyone think it is worth that for a used one. I have owned alot of other detectors, but have never owned a Bounty Hunter. I am looking for a back up unit. Does this unit get decent depth on a silver dime? There is precious little on youtube about the 505.