Explorer SE

I have one of the "original" SE's, bought new in 2006. Used it a lot and never noticed a problem. I have had to lay off detecting for a few years but am now back into it. From a forum I learned that the coil that came with it may have some kind of problem. SO my questions are: Did all the coils of that vintage have a problem or just some of them. If mine has a problem how would I know that since I have never used another coil?

I am asking because the suggested solution is to buy the coil that now comes with the E-Trac but I am not anxious to blow $209.00 if it's not necessary.

Any help out there?