Hey all. I have had my F2 for about a month,and all I can say is wow! I bought this as a "throw in my trunk" machine. I don't want to chance my CZ getting stolen. The first place I used it was the dry sand,and scored a nice "gold filled" bracelet. The second place I used it, is a site I have HAMMERED with my CZ70 (5" and 8" coils" ) The first target I dug using the 4" coil was a well worn 1897 barber quarter! It came from the middle of a path I know I have hit before,and gave a beautiful signal at 5 inches.I also found a small ww1 era lead soldier,and two wheats from the "teens" that the CZ missed. The third spot was a modern playground.I dug so much clad, I was sore as hell the next day.That little 4" coil is deadly! The good:Very light weight,drop in batteries,dead on pinpointing, super fast recovery speed,$125 used with two coils! The bad: Sometimes when I dig a good signal,and take the target out of the "matrix" The machine goes brain dead and has trouble relocating it.(minor annoyance),The notch feature is slightly confusing (again minor), My F2 swears every square tab is a nickel(yeah,I know I am CZ spoiled.) I will report back later on depth with the 8" coil.most reviews I've read say it won't go past 6" accurately.I will see.( I am in very low mineralized florida). Over all, this little"back up" machine rocks! Happy hunting.