The Librarian in Black has a few more things to say about co-browsing in her post How much is co-browsing really helping our users?
I stopped trying to use co-browsing a long time ago. It’s bad customer service to give something to someone that has a good chance of not working. Period. Everyone touts co-browsing as the cat’s pajamas, and it is kind of cool A) when it actually works, which is rare and B) when the user’s question actually warrants it…. I am not a co-browsing fan. At all. If the big-name software companies can get to work on a Mac with a firewall and a dial-up connection running Firefox, then rock on. I’ll be a fan.