Fisher 12” DD coils???

[Noah (FL)]

Does anyone have any experience with these Fisher/Tek coils?   FirstTexas has them listed on eBay for most of their machines.  I remember seeing them in the past for F75 but never heard much reporting on their performance.  

[YubaJ]

I bought one of these 12'' coils for my T2, but have only air tested it, comparing it to a Cors Scout, which won by 1-1/2". Soon I'll try it for real, been too hot. I notice on Fisher's eBay site that they want $300.00; what they'll accept? I got mine from NW Detectors in Oregon for $200. Hope there's some advantage to this coil.