You've gotten some great replies from some hard hitters that use the Explorer with great success.
Explorer CONS .....
It simply hates disturbed ground like plowed fields and almost any other detector will do better there until you really learn how to use it.
Has a fairly long learning curve but is well worth the effort.
The ergonomics could be better and it's heavy to swing all day for older guys like myself.
Needs a slow hunt pace to really perform well and likes the coil scrubbed on the ground for the most part.
Pinpointing may take you some time to learn with the stock coil, .... the 8" coil will make the overall learning process much easier.
Does not do well on tiny gold flakes (prospecting).
Explorer Pro's
Yeah it's kind of heavy ... but it is built TOUGH and you don't read a lot of post from folks complaining about something breaking either.
No other detector will out perform the Explorer in the iron, none, period ! The iron mask is the best in the industry.
I know no other detector that will hunt deeper and give good ID like the Explorer.
Has so many coil selections that no other single detector compares to it.
Will hunt ANYWHERE that I've taken it and overall performance is very good.
Once you master hunting by sound and less by ID, your finds will increase dramatically. The Explorer has a true sound card in it much like a home computer, makes it easy to learn when YOU really listen.
The finds made with Explorers versus OTHERS tells the real truth, no guess work here

Minelab customer service is 2nd. to none in the industry.
DFX ... personal experiences and just my OPINION
Pros ... will hunt most anywhere.
Easy to set-up, GB and hunt, anybody can do it.
Feels good in the hand, especially on full day hunts.
Pinpoints like a dream.
Has a fairly large coil selection.
DFX Cons
You have to be a constant tweakaholic to get the best out of the DFX, at least that's my take on it. I used one for 2 years and went back to the Explorer.
Depth is lacking compared to the Explorer ... any Explorer series.
Whites purchased their dual frequency technology from Minelab, couldn't do it themselves I guess

Everytime I've hade to send a Whites product in for service "out of warranty" they really busted my A$$ on the repair bill.
I've compared the DFX to the Explorer in the field so many times that
I finally learned that there is NO COMPARISON when all things are considered !
Reads like I'm partial to the Explorer doesn't it ?
I am ... and for good reason
Good Hunting
Mike