You know you purchased the best quality, not because the stainless finish was superb, the brass threaded connectors were polished to perfection, nor because the supplied drain unit was a brilliant screw out, easy clean system. And yes the water supply hoses were top quality. It was all of the above, but firstly, it was the supplied white gloves to able the installer to handle with precise care. 
The only experience that comes close is the Rolls-Royce customer care experience back in the day when that brand stood for only the best money could buy. I know what I am saying, I have owned three. Purchase with confidence this magnificent bathroom fixture! - Mark, in Palm Springs CA.