I saw this guy who works at the campus bookstore the other morning:
My initial reaction was that it felt a little dehumanising to employees, but after I chatted with him (and he agreed to have his picture taken) it turns out he found it rather amusing.
He also remarked that the novelty of the shirt seemed to make it rather effective – he was constantly being scanned by people when he was out and about. I found this rather interesting as most people don’t tend to bother using QR codes, but I suppose this is one way to stand out – I certainly noticed!