Howdy Leatherneck--
I am with you! I had the original Vision detector and then the V3i and I have NO regrets. I doubt that I will ever employ ALL of the features of this detector but I have read the manuel and regularly visited the old Findmall V3i Forum. Between that forum, the manuel and trial and error I was able to make custom programs for for each of the types of detecting that I do. So esentually the detector is a turn on and go unit. Of course, the first adjustment that I made was to place the most frequently adjusted settings on my Live Screen - Discrimination, Filters, Sensitivity, Recovery Delay, Transmit Frequency, Bottle Cap Reject, TX Boost and Search Audio. That simple action makes ANY in the field adjustment fast and easy.
As you mentioned, the "Simultaneous multi-frequency that displays adequate information" is amazing! When one learns the VDI range of desirable targets AND their corrosponding dominant frequencys the amount of trash dug is greatly reduced and that saves time to dig the goodies. Another feature that I employ , especially when relic hunting is the ability to customize the Tone ID feature. That enables one to ascribe whatever tone or no audio tone one desires for individual VDI #'s and that maximizes depth while hunting in All Metal.
Bottom line - the beauty of the V3i is that it can be customized to the specific needs and style of the user. How can you beat that? Best of luck and...
Happy Hunting!
Blind Squirrel