Really? That's serious - devices that cause headaches through normal usage I would think would be of big concern to those in charge of consumer device regulations. Did you use the device *until* you got a headache and if so how long, or did this headache occur *after* your using the device for a particular amount of time? I don't mean to be offensive, just probing.
Forgive me if I find your headache either non-existant, exaggerated or else limited to you and perhaps a few others (on this site ironically, and on the sites that allow Android users to touch Apple devices and discuss their experiences without death penalties being exacted), perhaps those who know the term "retina," perhaps those who are upset the mini doesn't have a retina or finally perhaps limited to those who merely derive self-value from contradiction and negation?
Apologies for my sarcasm, but seriously, getting a headache from a device like this I find lacks credibility and to use your term, "honesty", so either 1) I'm incredibly wrong, 2) you're using this device improperly, or 3) this isn't the only product in the world that causes you to get headaches from using it and your comments regarding the mini is ill-placed blame. Which is it?
I can't believe for a moment that if you get a headache from using this device and you used it correctly that it's the only device that would cause you headaches. If it is, then I apologise and I think you need to report your experiences to the consumer protection bureau, or your nearest Android support forum (sorry, couldn't resist the last snipe). If it's one of many devices that cause you headaches, the problem is you not the mini.
In my personal experience and opinion, this device doesn't cause headaches, and until I've seen a study to convince me otherwise, this device doesn't cause headaches and everyone else can judge for themselves what I've already judged regarding comments like these.