When I was introduced to Ebates I was skeptical, it sounded too good to be true. My skepticism has long since passed. They are Rock Solid in every way, I can't understand why anyone who uses the web to shop doesn't use Ebates. It's free money, plain and simple. Make sure you install the browser plugin that way when you visit a site that offers cash back Ebates displays a banner allowing you to activate your visit on the site.
In the several years I have been using them there has only been one issue, which they corrected immediately. The problem was with the merchant Dell, not them. Despite the fact that Dell indicated the purchase was made via phone and not the internet Ebates still gave me the cash back. It was almost $50 and they stepped up no problem.
Like I said, it's free money plain and simple.