Some data to consider:
Advantages: It is the domain with the used extension but and is advisable to register it for all type of project.
Disadvantages: It is difficult to find an ideal domain for his needs due to the great demand of this extension.
Something of history:
The .com domain was created in January of 1985 for commercial use; despite at the moment restrictions for the registry of new directions do not exist. In 1990, the .com domain became more frequently used for websites, especially those of commercial use. The introduction of the generic domain .biz, restricted to businesses, has not had greater impact in the popularity of .com.