+Light weight and costs pennies. (Doesn’t translates into being a cheap lens tho)
+Focuses very very close (a boon for creative wide-angle shots)
-Narrow apperture limits low-light use (Tokina 11-20 is the go-to for this, but also costs 3-times as much)
-AF Speed is moderate and STM struggles in hazy conditions.
Things to note:
Shooting at 10mm creates a distortion that is the highlight of ultrawide focal lengths and cannot be corrected in post-processing. Take a look at the photos before getting this lens. Ultrawides are not recommended for casual landscape shooting. Get the 24mm focal length lens instead.