I use the F70 Dan and it fits my needs very well. I detect on fresh water beaches mostly. It is light, easy to use and you can swing it all day and come back the next day and do the same thing again. I have been out 85 times (Days) this year. And used up 4 sets of batteries at 40 hours or more per set. That is 160 hours of detecting or more? It is dependable and I have found well over 4,000 coins (some nice silver) and some very nice jewelry with it. Thanks for reading and Happy Trails.....Z