Well, after getting a Fisher F4 at a garage sale 4 weeks ago. I got the bug. So 2 weeks ago I did a LOT of research on top end detectors. I finally decided on the V3i. Before getting the unit, I read, and read..and read.. along with watching Videos. By the time I actually got the unit, I felt I owned it for weeks. So when I got home.. I put it together..and drove to the school close by. I used the pre programmed CJ mode, without any tweaking. What a difference between the F4 and V3i. First thing I noticed is how much better it sorts out the trash. With the F4 I pulled a lot more screw caps. Also the depth right out of the box was impressive. I was pulling clad out from 8. I know I have a lot more to learn. But my first outing was a joy.