Firstly, thank you to all who unselfishly gave your views and ideas on the various Series F detectors I enquired about. At first I asked about the F70 and the F5, then about the F5 and the F4. I decided to go with the F4 for a couple of reasons. Firstly, I have never had or used a Fisher detector before (although I do have other brands). I wanted something that was relatively simple to use, but could be ground balanced manually and was a bit different to my other detectors. I decided to go for the low range of the series, because I didn't have a whole lot of loot to spend on a machine that I mightn't like. Additionally, I already had 4 BH concentric coils, ranging from 4" to 10" that I can use on the F4. Well, it arrived about a week ago, and it is different to all my other machines, and I like it as well. have not used it much, but so far it has performed as well as I'd hoped. The 11" DD coil is great...I dont have anything like it and it covers the ground so well...very sensitive and I was surprised at the depth. Probably more pleased than surprised. Anyway, thanks again to all of you (You know who you are!) who helped me with my enquiries....looking forward to posting something good in the future. HH Sapper.