>Anyone here ever used or heard of somone that used that service offered by Google?
>
>What can you tell me about it? Positive or negative.

You mean when you purchase advertisement with them so when users accessing Google site enter specific words in their search that your ad will be shown?

Or, do you wish to be included in the Google AdSense that many sites are using?

Or, is it about adding Google AdSense to your site?