Even if it might be overscale or not, seeing a 1/72 aircraft without rigging looks wrong in my eyes.
I have used 0,06 and 0,08mm fishing line up to now, but tried Ushi's Fine (the extra fine looks almost too thin in my eyes, though might be more true to scale?).
Takes a bit of getting used to, especially it being more flexible and the ends curling up when you add CA glue to it. Now that I'm nearly done with my Albatros and Fokker I seem to have gotten the hang of it, and though it does not add structural strength, it is nice stuff and less prone to breaking loose due to its flexibility.

The fine looks almost exactly the same in thickness/finesse on my D.Va as it does on my D.III.
Just my experiences as a first-time Ushi flexible rigging user.
Jeroen