It certainly worked for me!
So how does it work? You need to set up a Google merchant centre account in which you can add your products. You can do this manually or create a file that you can upload to process a batch. It’s not difficult to get the required information from your eCommerce website database to then upload to merchant centre. You then can link your merchant centre account to Google Adwords to administer the campaign.
The beauty of this type of Adwords campaign is that you don’t have to worry about keyword research as the product information is taken from your eCommerce website.
You pay for the click through to the product. Possibly you can see how highly targeted this is as your product won’t show up on Google unless someone is actually searching this particular product or something very similar.
If you sell products online. Take a look in to this. I think it could benefit your online retail business hugely. As I said, I had great success with it myself.