Benefits for Reviewers

• Reviewers are allowed a 10% Article processing fee waiver for each completed peer-review. The waivers sum up, and a reviewer is allowed 10% to 100% Article processing fee waiver depending on the number of reviews completed.
• Reviewers with a solid academic track record may apply for Membership in the Editorial Board upon completion of several reviews. 

Resources for reviewers

• Resources for reviewers (PLOS)
• Reviewer guidelines (ELSEVIER)
• Reviewer's quick guide to common statistical errors in scientific papers
• How to review a journal article: requirements, tips and strategies
• Writing the Review (PLOS genetics)