Share your experience!
It was just released, my suggestion go for the update, but if you are afraid of possible bugs then wait a week or so.
Anytime
Great to hear that, if you encounter any bug
do post it here
http://talk.sonymobile.com/t5/Xperia-C3-C3-Dual/Xperia-C3-C3-Dual-Lollipop-bugs/m-p/974876#U974876