Since you asked for any opinions I thought I would give an alternate view so you can ponder all the info.......
I'm most likely in the minority here, but no I don't feel comfortable inserting a chip in any of my boys. I just don't feel anyone has done any long term studies as of yet to see if the benefits outweigh the risks. Until then I'll rely on the old fashioned way, tags, and I'm also very careful when they're outside. They're always in a fenced yard and never out alone.
Here are some links to browse through......
chipmenot.com-homepage Are Micro-Chips safe and what is your alternative? | The Pet Whisperer? HomeAgain Pet Microchip Implicated In Cancer