Hi Guys:
Yes, absolutely, delete your old GV service provider configuration(s), upgrade the firmware, and follow the procedure we've discussed previously to set up GV using OAUTH 2.0 authentication. This is the technology underlying Obihai's announcement yesterday, and is what Obihai and Google worked out for "official" support going forward.
This is a much more secure way to give third-party devices controlled access to your GV account.
I tested it many times during the beta cycle, and it's solid. The problems reported by a couple of users are probably due to either not cleanly removing the old GV SP configuration, or being logged into the wrong, or multiple Google accounts, or possibly hardware or network-related. As long as you follow the sequence of steps, you should be fine.
Enjoy!