I think it is useful to know how people are saying about you to rank
Agree. Many ways to do that, and many don't involve adding G-code to your home page. The G-code displays a div that can drive traffic to G (that's their whole reason for doing this, right?), and potentially away from your site.
The better question is, "do you let G tell potential customers what others are saying about you? Or do you do it yourself?"
Avoid the whole G-mess, and post your own great metrics; ship-days, inventory turns, low shipping rates, etc. Make a sweet-looking badge, add an informative div to let shoppers know how great you really are. Why involve G?