Pros
--
good damge
very mobile
basically 3 flashes excluding summoner flash if you take it
if your ulti is up you are basically impossible to gank because you are in-targetable
high sustain
Great at assassinating low hp enemies
very strong cc
low cooldowns

Cons
----
great mobility is only a pro if you can use it, positioning is of major importance
you can get yourself into a sticky situation by misusing her ulti
skills shots, land them or die
can easily get nuked
Not very mobile at all when her ulti is down
*can* get out-poked in lane