I haven't used them since WAYYYY back when the dealer changed the oil for me. My owners manual says to use the HP filter. But I do think they are a bit pricey for changing the oil as often as I do, and I can't bear to skip a filter change with an oil change. All I've ever used was the regular Motorcraft ones, changed every 3,000-4,000 miles.
That page on the filters is very interesting. I'll have to look at it in detail later.
I work at a Ford dealer and the only time we use the "HP" filter is in the old 460 ci motors that require a FL-1A.
Customers with a heavy duty dump truck /flat bed/cargo truck and older RVs are the people that usually request the "HP" filter.
The HP filter has a much thicker case than the regular FL-1A to avoid bursting under certain HEAVY DUTY driving conditions.
The gasket is also much thicker and wider.