I used an F2 for about 3 years.
Silver, gold, relics, old coins and tons of clad is what I found.
My $200 invested turned into over $2000 in finds.
I used it in horrible mineralized iron infested sites in the SE and heavenly black low mineralized soil in he Midwest.
In the south I never got real deep but nobody really can here, in the Midwest I got deeper but mostly used the great sniper coil because I hunted many trashy infested sites.
Again not super deep out there because of that small coil but most of my targets everywhere rarely lay deeper than 6" so it was fine.
I always wondered what I could do with an upgraded model if I could do so well with that one and I learned that Fisher language well and then some and didn't want to waste that so an F5, F70 and F75 were all considered.
I would have been happy with any of them, the F5 is a completely different platform than the F2/F4, the F70/F75 is another...both are way more powerful with more features than the entry level.
A great deal on an F70 came my way and to this day I feel I was blessed...it is everything I hoped and wish for and much more.
I immediately lived at a much deeper level than the F2, even using the sniper coil I could get signals on targets up to 10" and more.
The standard concentric could hit that area too easily and a bit more also, the large DD coil got me to that area with no problem and I even dug a few targets even deeper at about 12 and one time a measured 15".
That one shocked me.
Moving back to the SE. I have used this thing to getting deeper than ever before with all my coils, deeper than most that I have heard of or talked to or to be specific deeper to these areas and figured out the strange signals and learned to ID them better than most that I know.
More power and extremely useful and advantageous settings available to me now is the reason.
I am a big Fisher guy because of what I have seen in real life, the F2 amazed me, the F70 shocked me more and more often...still does.
The F5 has tons of abilities, features, settings and knobs.
The F70 is a rat rod version of the F75...a few less features but way more than enough and all the same power as the Flagship and the top of the line F75 has even a few more whistles and a couple more bells.
If I was mulling over this choice probably buying new the anniversary edition F75 for $500 would be the one right now...considered a great deal by those in the know.
https://m.youtube.com/watch?v=7omVeK5Or_Q
Buying used there are usually great deal galore on all of these because so many buy them but never click with them...we who have love that, deals galore out there if you know where to look.
I have a couple of years and a few hundred hours under my belt with the F70 now and I don't think I would enjoy hunting with any other model as much right now.
There is no boredom threshold on the horizon at all, I have still barely touched the surface of what it is capable of and I have so many settings to play with that work well in every site and situation I have taken it to.
Super heavy trash, ridiculous amounts of iron, depths in both good and bad dirt...I have amazed myself, club members and friends I have hunted with on all counts with what I could do and find and figured out settings and techniques to conquer all of them with some jaw dropping results.
Upgrade...go for it.
Know the Fisher language...stay in the Fisher line and still use it.
Want to do more, find more, dig deeper and be constantly amazed over that F2...the upper end Fishers can do all that and much more.