im honestly sure when i say 1/2 of people who film with DSLR's on NS have that lens, like me.
I love my 11-16, a necessity for follow cams and as stated by 4BI9, they cause feature to look bigger up close, which is handy for dual angle shots.
I have a Circular linear polarizer on mine which is amazing, if you get an 11-16, i recommend getting one, but you can do just fine without one.
PROS:
Great for close up/follow cams
Pretty hefty( you can knock it around a bit without it damaging)
Cons:
Its UWA properties makes shooting things from far away a challenge, you have to be pretty close