Kas said:
The DFX 300 is nothing more than a regular DFX with a bigger coil. The bigger coil was added because the DFX is well known for poor depth.
Good luck.
Kas,
I do not know where you got your information from, but the DFX can go deep, if you learn how to use it correctly

. I own both the 9.5 inch and the 12 inch coils, and I prefer to use the 9.5. I don't like the added weight, the smaller coil is better for mineralized ground, and trash seperation, and it is a heck of a lot easier to sweep in any conditions other than open fields.
If you do not think the DFX can go deep with the stock 9.5 inch coil, take a look at the 1798 Draped Bust cent in my avatar. I posted that three days ago. It was 14 inches deep. It wasn't the clearest tone, but it was enough to inspire me to dig. Needless to say, I am glad I did!
If you would like to see more of my finds (most with the 9.5 inch coil) visit my site.
The DFX 300 is more of a marketing idea from Whites to sell a machine that will go even deeper than the ALREADY DEEPSEEKING DFX.
VS, give it time and as you begin to move away from the presets you will begin to enjoy the machine, and bring home jewels for the wife!
HH,
Neil