This is another reread; the first time that I read The Pilgrim's Progress was probably 8th grade or so. I enjoyed it then, and I enjoyed it now. What impresses me most about this book is the myriad Biblical references that are in the margins of the pages. Bunyan wrote all these in himself. His knowledge of the Bible is astounding. His poetry isn't bad, either. I love when authors begin their stories with a poem or two, and he does this spectacularly.
The life of a pilgrim is not supposed to be easy, and Christian's journey from the City of Destruction to the Celestial City clearly illustrates this. Pilgrim's Progress is one of those books that every believer in Christ ought to read. I know it gives me strength to see the struggles that Christian (and in the second part of the book, his wife Christiana) goes through.
I guess there's not much more I can say about this book other than READ IT! It can be clunky and hard to follow, because there are no quotation marks for those people speaking. The first time I read it, I had to follow it kind of like I was reading a play. That seems the best way to describe it.
All in all, a wonderful book. :)