That can't be answered because we'd have to have used what you did, and gray ghosts too, and probably on a Tesoro. I do know exactly what you mean though because in 2004 I was having headphone problems with my explorer and was offered a Koss set but was so different I stuck with my ghosts sound breaking up. That being said, my advice to you would be to buy a very good set which will last, and get used to them.
PS... Just this past Fall I came across the same problem as 2004 only this time all my ghost NDT cords were completely shot so i had no choice to borrow some, which ended up being Koss again. The sound was definitely different, but I know the detector so well it really didn't hurt me. Once a I had a few hunts it was pretty normal, but still less quality than my ghosts which I will make sure I don't go without again. If you were using cheap phones a decent set might be different, but it's different in a good way, you just don't realize it yet.