Let me explain to you why i would never use an Explorer although i have the money to buy one.

The Explorer is one of the heaviest detectors out there AND you have to swing it slow to get the deep stuff. Target response and recovery speed is slow.

If you put three coins from left to right with a space of about 5 inches between them and than swing the Explorer fast over it, it would NOT give you three signals.

Now the F75 with its lightning fast recovery speed will hit all three coins and even ID all coin right, in a split of a second.

The F75 is a lightweight detector and fun to swing, the batterie life on just 4 AA batteries is over 40 hours.
One more advantage is that the F75 will hit much better on small gold than the Explorer and it can be used for nugget hunting.
Depth is very good to on the F75, but even if it would be an inch short of the Explorer i would still use the F75 due to its speed. Better target separation due to fast recovery speed means more finds.