1) Reputation. ResumeWriters.com is one of the most well reviewed resume services on the Internet. They have an "A" status with the Better Business Bureau and a Google search for reviews turns up plenty of plaudits and routinely ranks the site as the number one service. From all I can find, I have to agree.
2) Age. Having been on-line since 1999, they are the oldest of the resume companies I researched. Being that they have been around for a while, I also found references to their work in all sorts of places from Time Magazine to CNBC to NPR.
3) Products. They have a nationwide network of several dozen writers, allowing them to claim specialists in almost every carer field. ResumeWriters.com also says that you work one-on-one with your Resume Writer until you are satisfied.
In utilizing ResumeWriters.com, what I liked the most was the personal service and attention that the writer gave me. You are contacted by the writer through their own e-mail address and phone number - it's truly personal service.
If you'd like to view some of their work, ResumeWriters.com has a very comprehensive library of Sample Resumes for your review.
4) Price. Their pricing is right in-line with the industry average. In addition they offer an interview guarantee or they'll re-write the resume for free. They also claim a 99% customer satisfaction rate.
5) Industry Affiliations. ResumeWriters.com is also affiliated with the Professional Association of Resume Writers and Career Directors International.