Hi,
Try to check up if a company is really certified Adwords professionals.
what you will get as answer from Google Team is :
"
   * The professional's business name.
   * Professional Status page hosting by Google. The prefix of the URL
string should be 'http://adwords.google.com/select/ProfessionalStatus.'
   * Google's validation of the individual or company's Qualified status."

When clicking on this link , you will get this message_
You attempted to reach a non-existent page. Please check the URL and try again.

Tell me how correct is that ? and how Good is Google with external communication ?