I also use the Done & Dusted 500ml bottle with white spray head. Couldn't care less about the colour of the sprayhead (or the QD) as lobg as it works, lol. The white sprayhead works fine, as spray heads go, it's a good one compared to some which can be rubbish. It actually does spray properly rather than dripping like some do.
As for the quick detailer, its excellent, I'd arguably put it as the best one I've tried in terms of finish and ease if application, other than Chemical Guys Speed Wipe which is also brilliant.