fwiw when I've heard it out, the DJ has mixed the piano bit out more often than not.

Hard to believe if you haven't heard it in a club but people went absolutely nuts to it last year, it was maybe THE big club anthem (the other contenders being equally minimal and sparse!). I would totally call it BANGING: it's because my preferred dance music is like this, that I never enthuse too much about Cascada et al.