As a new owner of a used DFX I can tell you there is more than one BOOK written on how it works, and how to use it. ATP turn it on and go.. DFX turn it on a go, but if you want it to kick the ATP butt, you will need to suffer the learning curve. If you don't like messing with configurations and get impatient if something does not work how you think it should work right away, you may not want a DFX. It can do a lot of stuff the ATP can't.. wet sand to dry to wet.. no problem.. 3kHz only for deep silver, 15kHz for gold and jewelry or to combat EMI. DC phase to read ground mineralization and better ID gold from aluminum. 191 tones with tone ID on, Non-Motion mode along with Discrimination Motion alone or both at the same time with Mixed Mode.. Whites also still fixed them at a very reasonable price. I had the choice of buying anything I want, no price limit really, other than what I feel is justifiable to spend, I bought a used DFX since it is a really good bang for the buck!