I don't have much to say except this is a fantastic script.
One of the best scripts around for pixiv for English speakers.
As the title tells, I recommend this to any fan of anime, manga, doujinshi and everything art-related and Japanese.
P.S. The "Purchase for 20$" thing, from what i understood, was an April fool's stuff that keeps going on (wonder why). I just pressed purchase and it installed, no strings attached. I hope (LOL).