I never used one, but I only briefly drove in temps below 10 F. The main advantage I would expect is a winter front prevents ice build-up in wet & freezing conditions. IIRC Modern trucks use electronics to shift how much coolant is routed to radiator. Winter fronts were more common on mechanical engines & fan equipped trucks 30-40 years ago.
just get yourself a good set of working shutters with a bug screen in front of them. If need be in the summer shut off air to them and leave them open. Without the shutters closed The NTC 350 small cam in the Pete will not warm above 120 degrees in the winter without a load. It will idle all day and never get above 100 on the gauge. In the summer it will run 140-150 all day if left open.
My '01 Cummins powered 379 needs it's winterfront used at about 15F. My new T880 didn't need one until -20F last winter.
I've only needed one on 2 occasions. I walked into a truck stop and asked for a cardboard box, bungee corded to the grill and rolled.. when your heat just isn't heating, go the cheap route and cardboard it!