As for the valve caps, I'm had mine stolen off every car I've owned for the last 40 years. I always assumed it was kids who wanted them for their bicycles. I was tempted to get the smart caps, but the temptation would probably be too much for some kids, and they wouldn't last long.
In just a couple of days of driving I have only had one person (in a new Mustang) pull beside on the freeway, flip me off and race away. That was weird, he must have just finished filling up his tank at $4.30 a gallon.
Almost all the responses are positive and everyone wants one. I say get in line.