1. Work is regular (when the budget allows).
2. They pay on time.
3. Everyone I've worked with has been professional and generally pleasant.
4. Reasonable pay for services rendered.
Svantaggi
1. NET45 for freelancers, so paychecks take a while to get here. This is not Mashable's fault specifically. All of Ziff Davis' properties are like this.
2. When it rains, it pours, but droughts also happen, so the occasional super-dry month.