I have an eBay clear TPU one: ...
Have you had a chance to try an NFC transaction with the case installed? It shouldn't make any difference since the polyurethane (PU) isn't a conductor.
Also, the "T" means thermoplastic, so the addition of some amount of heat will presumably make the case more pliable. Since others have mentioned that the N4 can get hot at times, have you noticed any tactile difference in the TPU case if it's gotten warmer while in your pocket while standing around the campfire for instance, or when the phone is in sunlight, etc.?
Does the case feel more tacky or pliable then? "TPU" is a fairly broad category of recipes, so it's hard to know what the threshold temperature is for any given eBay item ... hopefully it won't become tacky enough to pick up pocket lint?
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