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I have one. Unless you use NFC tags (or even know what they are), they serve no other purpose other than making your keyfob look cool. 
If you have an iPhone it is 100% cosmetic. If you have an Android phone with NFC support, there is a tag built into it you can use to trigger certain things on your phone, but even then I don't know many people that actually use those.Not sure what you mean, I have a iPhone so is it good or bad?