Link
I've had a copy of Gibbon on my bookshelf for nearly forty years, and have not so far attempted it. I wouldn't read it for history - because it's mostly based on 18th Century received wisdom and much of it is plain fiction. Which leaves reading it as a piece of Enlightenment literature. And going by the account of Clive James (and others, it must be said), I'm not sure it would be worth the effort. I do feel I should though.
I've got the audiobook read by Philip Madoc and that is soporific enough.... I can only listen to it in the car. I would never attempt the book, and think the Grand National analogy a very good one.