One problem with pet ID chips is that there isn't a fully-centralized database yet, or at least there wasn't last year when we got adopted by a cat that was pre-chipped by a rescue.
When you take a pet to a vet or place that has a chip reader, all they get is a number. They can't tell if it's an AVID chip or a Pet Watch or SOB (although by the number they might be able to venture a guess.) Information isn't cross-referenced, so the vet tech or whomever has to check multiple vendor databases.
Having a chip is better than NOT having one. I just wish there was some sort of way to have all the information available from one source.
(Funny note: When you try to type "Pe****ch" without the space in between the words, the RV.net editor thinks you're typing a naughty word. How funny.)