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In fairness to the original poster, many people don't test drive cars with adult passengers in the back (I test drove the MS with two of my kids, who are 8 and 11, so the rear headrests weren't a problem). Though the rear headrests look kinda short, one doesn't realize how short they are until they are in use by adults. I haven't had any complaints about them because I haven't yet driven an adult back there. But I can absolutely see that their height could be a safety issue and probably should have been designed to be minimal AND taller (perhaps a folding feature?).