I have 6 of them, but they are more gimmick right now than anything. I have one in my car to turn the phone to driving mode complete with nav and music settings. Tap my tectile again and it goes back to the way it was.
The best use so far for tectiles that I have found is if you have a friend or family member coming over to your house and you want to give them guest access. All they have to do is tap the tectile and they are on your wifi. Makes life easier there. Of if you do digital business cards and email info, it can be good.