Pretty good, not bad, I can't complain... (12th in the search for the ideal edition for an MDM)
Here's a decent edition that's easily found from online booksellers for ten or twelve bucks—the Penguin Classics Deluxe Edition, with a Foreword by National Book Award winner, Nathaniel Philbrick.
[Spoiler: If I didn't have something better waiting to be reviewed, I might end my search here.]
It's fairly stripped for marathoning, with the Northwestern-Newberry text, the aforementioned eight-page Foreword, and eight pages of maps and instructive diagrams; 673 pages in total. Fans of cartoonist, and native New Englander, Tony Millionaire will recognize his hand in the front and back cover illustrations.
It measures 5.5" x 8.375" x 1.75", and weighs 24.8 ounces. The cover is soft card stock (which, on the copy I borrowed, was in pretty sad shape after 18 months in the public library). The binding is glued, but seems flexible enough not to crack. The paper is light cream-colored; smooth, thick-ish, and flexible, with a cotton-like feel and very little show-through. The pages are "trimmed," that is, not cut to have a clean outside edge. (See the bottom photo here.) Trimmed pages give the volume a sort of ridged outside edge. This has the annoying effect of making the book impossible to flip through smoothly.
Margins and gutters are acceptable. Chapters begin on a new page. There are chapter-title headings on the recto pages and chaper-number headings on the verso pages.
You can't go far wrong with this one, but for me, a reader who likes to riffle through a tome to search out a favorite passage, the trimmed edges are a deal-breaker.
Especially since I know what's coming...