Make sure you pick up the unabridged version. The one that was originally published was trimmed and censored somewhat to keep the publishers happy. Didn't read the original, but it supposedly suffers from the cuts.
I've just started to get into Heinlein's works. The unabridged Stranger may seem long, but it flies by much faster than something like Atlas Shrugged - a book that is a great concept, but to be honest, Ayn Rand really needed an editor to help with pacing and trimming.
Oh, no! Please don't get my started on Rand. This has been such a pleasant thread...