From December 17th, 2016 to October 17th, 2017, 50% user give 5-star rating, 50% user give 2-star rating. for PriceBlink Lite - Coupons & Price Comparison chrome extension.
Seems to me similar to regular Priceblink except you need to remember to click on an icon to pull up the toolbar. If you are on a site that it is working, it will light up otherwise it is a gray shade.
Priceblink full version compares prices when shopping at Amazon.com, Newegg.com, BestBuy.com, Staples.com, etc. But this Lite version only mentions "coupons" found or not found.