The DFX, even with the DD coil, is much better at pinpointing. What do I mean by better? The pinpoint is more accurate due in no small part to the VCO it has. Also, the pinpointing trigger is much more user friendly than the pushbutton on the Explorer. The DFX has the two bars that aid in letting you know when you are precisely over the strongest signal, and it has a depth reading in pinpoint mode. Finally, the DFX has a setting for increasing signal strenght in Pinpointing mode. The Explorer's pinpoint signal strength seems to be less than the Disc mode.
The Explorer is a great detector, there is no doubt about that. When it comes to pinpointing though, let's just say that it does not lead the field.
The X-1 and the Periscope probes help, but there have been times that I've had to give up on some of my Explorer targets even with the use of the Periscope. That is never the case with the DFX, and recovery is noticeably faster when using it over the Explorer. This is especially true on deeper targets. The DFX seems to be more accurate with depth, where the Explorer seems to become less accurate. I don't have an explanation for that, but it happens.
I'm not saying this is a fatal flaw, but I'm hoping future Minelab machines have some improvement in the area of pinpointing. I would not let that stop me from buying Minelabs however.
Also related to this subject is the X1 probe. I've decided that I'll probably get one, although I have the Periscope. There are just some occasions (such as gravel) that I feel like The X1 would be more helpful. I also need something to help me more quickly discriminate out more than one target in the same hole. I'm not sure this will help that much or not, but I guess I just want to be prepared for anything. I'm sure I would still use the Periscope more often as it allows you (when you can pinpoint close enough with your detector) locate the targets while they are still in the ground. By doing this you can detetermine a targets size and other information to help you decide whether to dig it up or not.
HH Alton