Well Stu, let me put it like this. I've never heard of a single serious SE person who uses any of the "live pr" tools for anything.
It's a gimmick. The only real use I can think of for it would be to try to convince somebody your website has a higher pr than the googlebar shows, so that you can talk them into linking to you, or buying your website for a higher price.
Now, if you have a property you are trying to sell, and you think your buyer can be influenced with a higher "live pr" than the googlebar shows, well, it's your choice.
But there is absolutely no guarantee than the 'official' pr the googlbar shows will match the "live pr" when the next pr update comes.
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