I heard it once and I LOVED it. I did not like the 4 songs from last year's EP, but I do like this song. It will calm down my thirst for Dark Horse and Werk Bitch! Good job Katy B!
Melody wise, it's one of her best, though. It might be the best chorus she's written.
The chorus is pretty epic (and the bridge is something on another level) , but I don't know, I don't see this smashing or being a hit, not that I care, but she deserves to be a huge pop star!