It is small but definitely worth while. Need a quick story and map? This is it. You can run this on the fly with only a few minutes prep. Of course how long it takes to go through with the players is always a question of how extreme they are - so the potential for a couple hours of play is here.
I have several of these they have all been the same quality and presentation. It is more likely to be used as a quick random adventure encounter (especially since that appears to be what it is for).