They can be job seekers' ticket to land a job. It will dramatically increase their chances of getting interviewed. With the correct format, their efforts will eventually pay off once they have opted for a job interview. However, one of the biggest mistakes of creating one is that people tend to copy on the Internet. Some of them are looking into others' letters on the Internet and make it their own. With a little bit of editing, they can be able to pass it. Companies nowadays are aware of that scheme, so people should take effort in deciding whether they will copy on the Internet or they will create their own, unique and compelling letter.
You do not have to worry much about being a copycat if you do not find the most unique cover letter format in town. Just be sure that the contents of the letter have a clear and definite direction. This will bring about a good flow in the contents of the letter.