To help you optimize your bid adjustments, we're introducing bid adjustment reporting in Google Analytics, allowing you to analyze performance for each of your bid adjustments across devices, locations, and time of day. You can access the new report by going to Traffic Sources > Advertising >AdWords and clicking the Bid Adjustments link.Google's New AdWords Bid Adjustment Reporting In Google Analytics [adwords.blogspot.com]
With the new Bid Adjustments report, you can take advantage of the full range of visitor metrics available in Google Analytics to optimize your bid adjustments. This provides a window into your users’ behavior, allowing you to optimize bid adjustments based on behavior & goal conversion data like bounce rate and time-on-site.
In addition, with Ecommerce tracking enabled in GA, you can now use this data to fine-tune your bid adjustments in AdWords based on the actual revenue generated, instead of conversions. This means you can optimize for ROI instead of CPA goals.