Alright, so I got the list of "edu links" and paid the $10 for the list. I ended up getting a list of 12,000 domains in text files. There is no way I can check all of these at once, but for the sake of this review, I took the time and randomly picked about 30 links to leave comments to and see if the links would stick. Although all the links went to where they were supposed to go, many didn't have an option to leave comments or had comments disabled.
Of the 30 links I checked, 3 sites had my comments stick with my link. PR wasn't the highest on those links, but they stuck nonetheless. For me personally, this wasn't a bad pickup for the $ since I now have a tedious task that I can give my intern to do for a while
If you don't mind sifting through a lot of links and testing which ones accept comments, its not a bad pick up for $20 bucks...
What would make this better is if the OP would do the leg work and optimize this list to the ones that actually do work and are quality.
So there's my honest review!