Im new to the F75 LTD, less than 30 hours on it - enjoying it. I just got the Ultimate for my F75 and have just a few hours in the field with it yesterday and some time over my test plot. In the plot it ID's almost two inches deeper. My short field time shows it is light keeping the detector a delight to swing. The coverage is welcome for field work but I did not dig enough targets yesterday to add much. However I have had the 13" Ultimate on my V3i since March and have many hours behind it and I am pleased with it for open areas. I used the 12x10 SEF for many of the 5 years I've had the V and prefer the Ultimate, tho im not letting go of SEF because mine is perfectly tuned for my V3i and the performance is close. The U13 on the V: I have pulled many coppers, musket balls, 3 Spanish silvers (two 1/2 reals and a 1R), a seated dime, small bits of silver jewelry and a SL quarter from "my" go to farm field this year. I also found 8" silver dimes and wheat cents on edge in the proverbial "hammered" park, really.
As a further endorsement I recently got the 13" Ultimate for my ATP and it truly made a large difference in identifying targets at depth. In the field and over my plot it is way ahead of the stock coil, plus I can swing it all day. So I have high hopes for it on my F75. With the different Fisher modes and tuning options I'll hold out on making any such recommendations here (as I mentioned with ATPro)until I get more time in.
Lastly for those who think the build is not robust, consider that the supports are not epoxy filled, saving weight. Time will tell how the coils endure for me. Be assured if they have problems you will hear it from me, LOUDLY. Ive considered NEL, Mars and the regular Detech SEF coils so I know what is available, I only keep what works. I'd love to grab a MARS discovery, I realy want to test one.
I havent been on the board for a while. thats my long winded .02$