I have the Plantronics model with the little blue light, too. It's made life easier for me when I'm at work. I leave my cell on my desk because it's harder to fasten on a cell phone for women, I think. I don't miss calls anymore. The only problem sometimes is the awkward moment when you seem to be muttering on to yoursel, An employee kept saying, "What? Me?" till I said, "Could you excuse mefor a minute, please? I'm talking to my husband! We were both embarassed.
They are getting very common where I work, so I don't think anyone really notices them anymore.
As far as security, I don't see in the booklet if it's a v1 or v2...