Promoting digital products is a different ballgame than promoting tangible items. With tangible products, there are manufacturer specifications and consumer reviews. A product works, or it doesn't.
With digital products, which are informational in nature, there's a lot of opinion that plays an important role in whether or not a product is viable. For example, with this report you're reading right now - you can't fully judge it based on consumer reviews if many of those consumers aren't action-takers like you are.
That works both ways, too - maybe a product is getting rave reviews and when you buy it, you find nothing new in it. That's because it was geared toward newbies and perhaps you're more advanced.
Here are some tips that will help you promote digital products so that you convert better and have fewer refunds along the way.