I have both machines and my wife has an X-Terra 705 also. Lets talk stock machines E-Trac vs X-Terra 705. The E comes with an 11" DD, the XT has a 9" - 7.5 kHz concentric. So the XT can't quite match the depth of the E. The E gives you a lot more information on the ID of a target with its FE - CO numbers. I hardly ever dig a rusty bottle cap with the E, can't say that about the XT. The E has some weight to it 4.8 lbs vs the XT at 2.9 lbs. With the XT you can as you know run 3 different kHz by switching coils, so for the price of a coil you have a different machine. I do think the E is a better machine and worth the cost, I had the XT out last time the wife and I went hunting, my shoulder was a bit sore so I went with the lighter machine, had the 9 " - 3 kHz coil, multi tones hit an iffy target. I could hear the iron and the high tone, ID numbers jumping around.. Dug it found, a rusty nail and then a little deeper and off to the side in the hole was a clad quarter. Would the E hit it? No doubt, I have dug many a coin with junk in or near the good target. I bought my E used and I bought the 705 used also, no regrets on either. The E-Trac and the X-Terra are both top of the line machines, The E can do things the XT can't and the XT can do things the E can't. The XT with the HF coil is a better gold machine than the E. I will start out hunting with the E, if I run into heavy trash which for me is 6 hits per 1 way sweep I will switch to the XT with the 6" 3kHz DD "Digger" coil. The E with its DD coil and all the various features it has is one of the best machines out there. The XT is also one of the best single frequency machines out there. Best of luck with your choice, and Happy Hunting!!