I bought these 0,08 spares for my two 12-string guitars (high G-string).
They don't break easily, but you never know.... D'Addario has never let me down, except for an occasional broken string. I had a set of strings of another brand, put these on, broke the 0,08. Replaced it with one from yet another brand, which let me down too. I replaced it with a 0,09 which is still holding.
I will replace the whole set in the near future with D'Addario Phosphor Bronze 0,10-0,47, and probably will NOT break the 0,08 ever again.