I do not own a V3I, however my partner (my father) whom every time I go hunting with does. The biggest, two most glaring differences I've noticed between the V3i and the E-trac is the V3i's ability to identify what type of coin is in the ground better than my E-trac, and the E-trac's ability to pick coins out of trash. This may purely because of my, and my fathers skills, or where we hunt, but I do see this regularly with OUR SETUP. Also, after watching Goes4ever's pinpointing video, I'd be willing to bet that there's no other machine out there I could use to pinpoint as speedily and as accurately as I can with the E-trac. Also I get a kick out of when we unload the truck, and have already started digging a coin, to peer over and see my father pumping his V3i to accurately program it. Lastly, is the customer service end. The V3i IS American made, and White's ( from what I've read) has the best customer service of all the manufacturers, whereas Minelab ( again, from what I've read) has some pretty slow, and often unreliable customer service, I have no personal experience with either, that is just what I've collaborated from reading 100's of threads when I initially made my decision between these 2 TOP OF THE LINE detectors.