I ahev never heared any of our vets, or vet tech friends, mention any problems. I do recall reading that there was a lack of standardization in the chips some years ago, so that a vet's reader might not be able to read a chip in a different format. I hope that is worked out my now.
Our dogs don't leave the place, so we elect not to chip them. If I had one with wanderlust, I would consider it, too.
