I have not, because I actually prefer to read the full book, even if my Tsundoku keeps growing. Another way that I look at it is that even if I compressed my unread books into summaries, I would then just get more and more summaries, ending up with the same problem.
I recommended it to you because it sounds like you really want to read the books you have or are accumulating, so you might find it valuable, even if I don't.
I prefer to read the full book as well, I just know that there are certain books for which that will never happen. For example, I would love to have already read one of those 4” thick biographies of Winston Churchill but I have almost no desire to start reading one of them.
I recommended it to you because it sounds like you really want to read the books you have or are accumulating, so you might find it valuable, even if I don't.