Yes, it is. But there are similar and more relevant chronicles - for instance, A Dance to the Music of Time.
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well, it takes all sorts. I tried to read A Dance to the Music of Time after it was dramatised on Radio 4 (or was it the Home Service) and failed utterly. On the other hand I picked up Ulysses just a couple of months back and my eyes almost started out of my head - the book is a rush! Sentences pop and fizz like Red Bull and Coke. Sometimes I found myself thinking 'stop, this is too much all of a sudden'. Lonesome Lane a-gogo.
I started A la recherche sitting beside a lake in Guatemala in 1976. I finished it on the Trans-Siberian Express two years later. (Yeah, I know, just suck it up, Tea-peeps). I doubt a month has gone by since when I haven't picked it up. These days Project Gutenberg is my friend - remember that the chapters can be over a hundred pages, so the bit you hanker after is hard to find. I type in a word or two, PG finds it for me, I wander downstairs and sit in the dining room, which is a room without distractions, and spend an hour or more just reading for the sake of reading. It's something you give yourself to - the text rules the reader rather than the other way around.
Is it worth it? Well, not if you think 'I'm going to read this and I'll be the better for it'. For me it's part of life. I don't read around the book - I've got an excellent volume that discusses all the paintings that are mentioned, and there's no doubt that Proust saw a great many paintings, knew a lot of artists and collectors and was very discerning - but the learning isn't what moves me. It's a story (people forget this) and it's written in a way that is just such a delight to read. It's not the most insightful or rigorous of books, nor anywhere near the most analytical. It's a waterfall of language conveying an intensity of meaning that doesn't have a parallel.
Proust's writing makes you look and look and look and look at everything, without getting (hopefully) precious about it. It's the perfect antidote to architecture (or, more generally, the worship of objects) because the subtlety and vitality of the language can't be matched by things. It's the finest accompanyment (sp?) to love, to respect, to inquiry, to enjoyment, to the appreciation of simple stuff, and, there, I think, lies the gain. It won'\t make you a cleverer person (obviously) and it won't make you irresistible to women (dammit) but it will keep you on your toes and add light and shade to your life.
That's an anti-intellectual appreciation, but, hey, I'm in the fortunate position of not having to be learned. There's an industry devoted to literary analysis, but, happily, that's all a bit more than I can manage. I just read the book.