Haven't did to much with my upgraded F75. Florida was a complete bust. A few old but good spots that I worked pretty good produced nothing, no re-generation hunted spot. But I did go back to the lake beach in my town. Now at this small lake the owner completely drained it again so I took the F75-2 down for atry. Now on other hunts I was not able to use the F75 at all, it was totally UNSTABLE no matter what you did, all my hunting here was with the 1270 and 555-D. So when I got there and fired her up in FA mode she was chirping like a bunch of baby chick , it was so erratic. So i switched it to BP mode with 95 Sen 10 DISC., ! tone and she was quiter then she has every been just a few pops so I tried changing the Freq. which never helped before, F1,F2,F3,F4 no difference. F5 bang stone quit, first time I could even get the coil to the ground. Now I have beat this place to death, walked 10 feet and bang a 1944 P silver nickel, 7"'s checked the whole and a shakey 81 about 3"'s away reading 11"s with 3 bars on the confed. meter. Will she was just about 11"s but not a quarter, 1941 Walking Half, 3 fett away a 1935 Washington. That day I ended up with 8 coins:5 Wheaties, 1 sil. Quarter, 1 Sil. Nickel 1 Sil Reg. medal, and the walking half at a place you couldn't use the F75 LTD so what I'm saying that the upgrade is working for me.And don't rule out the Freq. change it seemed to help. Also and I'm Going to call Jaun about the FA mode noise cause that's the same thing it was doing when when I made that erratic video, but first I'll try it at some other areas cause this is the fist time its did it since I got it back the second time. Oh you can see why I got the 81, she was on the edge.