Since you used IE 10, perhaps you can tell me, because I've been reviewing it's bugs to some degree. I don't know what all of them may be, but one that apparently was common...if not universal, was that it disabled Aero, which in itself is sufficient reason that I wouldn't have cared for it. You didn't list IE 11 in those which you have used, is that because you haven't installed it, or that you haven't had it installed long enough to feel that you can comment on it? If you have installed it, is Aero still functional on your computer? Have you noticed anything else that you find disagreeable?
EDIT: Referencing your first statement, the blocker released previously were only similar, not identical. Apparently, the blocker has to be designed for specific registry keys depending on the version of IE in question.
EDIT: I wasn't familiar with Dragon's Den, so I went to that website and attempted to view the videos, and all I got was a black screen and an audio saying that this content is currently unavailable (using IE9). I then noticed that there was a yellow bar with the message that the website required a Windows Media Player extension installed, which may or may not be the reason the video didn't work. I never use WMP, so I didn't install the extension.