Can OER be high quality if it is free?
Are commercial textbooks high quality because they're expensive? What kind of review process do they actually go through? How do we rate quality anyway? What factors are considered important? What matters is student learning and student success. Writing, editing and design will have an impact on that. So will accessibility and cost. I imagine it is relatively easy to compare textbook A to textbook B and decide which is better based on content and presentation. It would be more difficult to determine if textbook A is $100 better than textbook B, or if students would derive $100 more of value from it. Due to CC permissions, OER can be modified to fit the needs of an institution, a department, an instructor, and a group of students. They can be continually modified to improve student success.