Just the name of this topic, "Quality", is so ambiguous as to be the core theme of the well-known book, "Zen and the Art of Motorcycle Maintenance". In the case of the author, Robert Pirsig, the quandary of "what is quality" led him into shock therapy. I would prefer to be shocked by a low-quality power tool than to be intentionally shocked because I couldn't decide what constitutes quality.
Richard L.