Finished my EPQ today! Did my presentation last Wednesday and handed in the essay on Friday, but it didn't feel finished until I signed off all of my logbook today.
In retrospect, I'm glad I did it. But you have to be seriously self-motivated and ensure that it doesn't get in the way of your other subjects.
If anyone needs any advice on it, feel free to PM me. But I'm rubbish at helping with title ideas etc.