Only started running these recently and was totally surprised by the results.
Only problem is that I attached them to one specific campaign targetted at blue widgets, but the google product feed uses every widget we sell, so in effect the campaign running is for everything we sell rather than the limited campaign.
Is the simple answer to now develop a range of product feeds, i.e. a blue widget feed, a red widget feed, a baby widget feed, a metal widget feed... and on and on and on. do you see where this is going?
Or is there a better way?