Ventajas
I've been working for RPM for several years and have been extremely pleased working with the company pretty much full-time as a freelancer. To the reviewer who noted that it seemed scammy--it's not. The ownership and admins are extremely honest and are looking for reliable freelance writers and editors they can count on. The company specializes in SEO content writing and has many contract accounts all over the US and Canada and quite a few abroad. The content is at different levels, from entry-level basic webpage copy to more advanced research articles for skilled copywriters. Pay rates vary. The application process is to send writing samples first. If they pass muster, then the company pays for you to write an assignment, which is evaluated on following directions, writing skills, and content.
Desventajas
Compensation varies based on the level of the assignment, so the lower levels don't pay as well.