One con is you won't get a trim tab.
As Howard notes, that's a "pro", not a "con". If you have different deflection on the fixed fillers at the ends of flaps, the inboard and outboard flaps line up differently at different deflections, changing the flow around the flap tips from inboard to outboard as you move the controls. This can cause otherwise unresolvable trim conditions, much bigger than having full-span flaps and tweaking them.
You don't want the "shear" of flow around the tips of the flaps, where the filler is pushing the air one way, and 1/16" away, the flap is pushing it a different way. Its livable if the relationship of the flap to the filler is the same on both sides, but still not as good, even if everything is straight.
This is the one and only intentional change I made on my 2006 and now 2020 model. The 1995 and 1999 versions had fillers, the current versions have full-span flaps.
Brett