With data sheets you can present technical data (for example, how many inches has a TV or similar information) in a nice and clean table. Here, you can create data sheet frames, and fill them out in the single reviews:
In this screenshot, you see a filled out data sheet for a single product. While in the settings you define the general data frame, in the single post you will enter the specific data.
You can create more than one frame, since you might review differnent kind of products in your blog.