I enjoy this show immensely, mainly because one has to think, not have a catalogue of general knowledge which is tyical of quiz shows generally; such shows often require local geographic and people knowledge.
I usually manage to get up to the 1% question and have managed to get that one several times. I occasionally miss an answer along the way, maybe in one show in three or four. Much more satisfying than The Chase which is good entertainment thanks to the host but general knowledge is not particularly useful beside an ability to solve problems which is a mainstay of my hobbies and ex-profession.