I will not be installing the OTA update on the new TB. (At least not until it's been out a while, and proven free of major bugs.)
I've found Verizon's customer service to be pretty good lately (last 2 years or so). At least they put someone on the phone that's a native English speaker. I compliment them on that every time I call, hopefully it encourages them to keep it up. Actually, the 2 I've dealt with in the last 2-3 months have been bright and actually seem to care.
If anything goes wrong with my 3rd TB, I'll ask for a different device. It's a pretty nice piece of hardware, but it's not so cool that I couldn't switch to something else.