Today I finished reading Powell's A Dance to the Music of Time. I think it took me about three years, but I was not in any sort of hurry, mostly reading the novels at work during lunch.
Looking back I don't really know what to say having now finished. Of course, I would recommend that one should read them, but I would not make that recommendation to everyone. I don't think one would like them unless one was of an especially literary bent.
If you do start reading the series, give it some time, don't give up after the first novel. The further in you get, the more you can see how elaborate the tapestry was woven.
After I ponder this a bit, there might might be more to say.
I probably will start over again, and read them all through.
Next stop Proust?