Some staple guns aren't designed for materials harder than fiberboard. If you are doing upholstery work with "furniture grade" woods, you'll need a staple gun designed to punch through. Fortunately, there are powered staple guns made especially for furniture work, such as the Maestri C7 Electric. This tool is billed as being good for both wood and vinyl like the type used for restaurant booths and college dorm furniture. Some electric staplers are recommended for "light" furniture woods and carpet laying, but if you are using the gun mainly for upholstery, get the unit that can penetrate hard woods -- better to have too much power than not enough.