I'd been busy replaying Half Life 2 and reading about Portal on UserFriendly and The Whiteboard. So, I caved and bought it. I wish I had known that before I got Half Life 2, Episode 2. Because I would have just got the Orange Box for $9 more.
Anyway, both games were great. I know some reviewers complain about the length, but I appreciate getting the content now and not 5 years from now. I also value the replay as being high. I've gone through Half Life 2 about 4 different times and enjoyed it each time.