Any comment on the Canon EF-S 18-55mm STM and EF-S 55-250mm STM lenses?

From what I gather, Canon redesigned both kit lenses. This meant not only the inclusion of the STM, but also improved optical performance. I can't seem to find any image threads showing the work of these two lenses.

Any comment on the viability of these lenses used between f/8 and f/11 for landscape photography?