What are the pros and cons of this aerodynamic design?

This seems to be a popular fictional concept of an attack aircraft for Argentina (found the pic through gdcdreams and starshipmodeler) sites,

in general, FSW wings give the following advantages

-better transsonic performance
-rumored to give better lift
-higher angle of attack

along with these problems
-wingtips tend to flutter.. but this is supposedly rectified by using composites
-drag
-perhaps RCS increases?

was wondering what your thoughts on this design are 🙂