I bought a Pro coil for my Ex 11 when they first came out and used that coil for at least 400 hours. I never had any targets I couldn't find. I immediately noticed how much better it separates close targets. I sold that detector last winter and bought a used SE Pro. I used that detector for many, many hours and it behaved perfectly. The only quirk that I have found with this coil is with shallow targets(an inch or so deep) I found many of these coins pinpoint at least three inches away from the center of the coil. Both coils did this exact same thing ans I wonder if this is what guys are calling ghost targets. The next time you get one of these, try using your probe to see if there is something off center. Not being a smart !@@, but I would like to know what some are experiencing. Thanks R.L.