Hi, I dont have a Fisher's detector, and have never yet had one. I would like to get an F75 (definitely cant afford) or an F 70 (dont think I can afford), but circumstances may dictate that I start my Fisher's experience with a lesser model. Am thinking in terms of F5 or F4. Have read good things about the F5 and have watched Bill Ladd's video, and it seems very good. I've also read good things about the F4 and seen it favourably compared to F5. Would like to hear from F4 andF5 owners and I WANT you to be biased; I want to hear why you think your detector is good, as that will help me decide if it will be good for me. Thank you in advance. (Am also considering an X Terra 505, but would like to try an F series detector if I think it will be better). Sapper.