I think that some folks are waiting to hear some feedback on the upgrade option. I'll be the first to make a few observations.
I've been an F-75 owner since 2008. I hunt every week of the year (no snow or frozen ground here) though I only hunt about once or twice a week with the F-75, 1-3 hrs each hunt usually.
Concerning my background in the hobby, it has been my favorite hobby since age 12. I started in 1966 (I'm 60 now). So I got 48 years in the hobby. Hunted all over the U.S.A., but only a couple of foreign countries. Hunt both relics and coins.
I sent my 2008-vintage F-75 back to the factory for upgrades on Nov. 3rd and got it back today (11-17), so exactly two weeks turn around time.
Got it back late this afternoon and only had about an hour to test the upgrade on a site that I have hunted relics for 25 years. It is a somewhat small site occupied my by the U.S. Dragoons in the 1850's. I have pounded it over the years with a couple of very good relic machines. Its been pretty hard to find anything there for quite some time. I'll use the words "cleaned out" for this one. But there is a low hanging power line over a part of the site that has required me to run the F-75 at low sensitivity because of the EMF from the power lines. It has really messed with my machine over the years. So today with my "upgraded" F-75 I went straight to the area beneath the power line. I cranked the machine up to 99 sensitivity and was in PF (plowed field mode) because it is exactly that, a plowed field. The first thing that I noticed is that I now have a quiet, smooth running machine. NO chatter at all. None. I quickly dug a coat-sized (19.5 mm) Eagle "D" button dating from the 1840's, followed by a .54 caliber round ball from a Model 1841 Mississippoi rifle. They were not all that deep. Maybe 7 inches. But in a spot directly beneath the power line. In the past the chatter induced by the power line caused me to miss these to shallow targets.
In summation, I must say that I am very pleased with the upgrade, if nothing else, because the EMF problem appears to be gone thanks to the new shielding the Fisher folks installed. I also now also have boost and cache modes, but I did not get a chance to test them today, so as yet, I have no comment/opinion. Hopefully I can test them out this weekend.
I hope that this rambling discourse is of some use to you. Good hunting guys, Geologyjohn
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