Success with Google Merchant Center
We've been seeing great success using Google's Merchant Center to promote products, allowing us to get products on the first page of Google through the 3 shopping results. We've been using Merchant Centre on various websites including Acorn Printing selling their personalised hoodies and the Workwear Shack selling Dickies workwear.
Use Google's URL Builder tool to monitor the lcicks from Google Shopping to measure the success of your Google Merchant Center campaign.
Highly recommend that you check out the Merchant Center and give it a go. If you have problems setting up the Merchant Center feed get in contact and we'll be able to help you.