I've taken Coursera's An Introduction to Interactive Programming in Python offered through Rice University. I paid $50 for the verified certificate under the "Signature Track" banner.
The Instructors who made the videos were quite excellent, they really seem to care about doing what they do well. The online community that you use for self support was also quite excellent. The overall experience taking the course was outstanding. I already knew a bit of Python but used the mandated class deadlines to make sure I covered all the material.
The problem I found was that at the end of the day it was nothing more than advertising for Rice and very little value for the Signature Track. They make it clear in the fine print that the certificate is from Coursera and not from an accredited institution. Until the schools are willing to put the weight of course credit (or even CEU's) behind it, it remains nothing more than interesting exercise.
"BIg Education" is trying to have it both ways here. I also think Cisco/Microsoft/Etc certifications are little more than advertising for the vendors. At least they stand behind the work that you do.
I don't regret taking the class and don't know that I would list it on my resume. Taking it as a learning exercise, it's outstanding. Anything else it's probably not worth the effort. It's not as blatantly cash grabby as W3schools certificates. I mainly paid the fee to make sure I'd finish it as I assume the course completion rates are atrocious with the bulk of people signing up and never submitting the first weeks assignments.