I have one without rails and I want one. I'm one of those people who likes how they look.
I would have traded for the parts required for the swap, but after looking at the amount of labor required and the number of interior trim parts that needs removal, I have decided to wait till I become more familiar with the vehicle.
I have added functional rails and crossbars on my last Honda CRV and it was so much easier to do. Everything was done from exterior of the car. It costed me 170$ altogether.
Wondering why it has to be this complicated for explorer? Also design wise, I think the nuts welded on the roof frame (Honda) is a better design than the holes that needs waterproofing (Ford).
Also now I understood why the Ford sales person was evading my request to add one from dealer side, before I took delivery.
[Rant over]