David Bogue and James Bennett, History of the Dissenters, Vol. 3, pp. 17-18:
[George Whitefield] is said to have studied this book [Matthew Henry's commentary] literally on his knees, to have read it through four times, and to the end of his life, to have spoken of the author with the most profound veneration, ever calling him the great Mr. Henry.
There are many different editions: concise, abridged, study Bible and unabridged, single or multi-volume, online or hardcopy. The unabridged edition will, I think, provide the most spiritual benefit to the diligent student of God's Word, but I would encourage anyone who is willing to take up whichever edition is most feasible for them.
Philip Doddridge, Lectures on Preaching, in Works, Vol. 5, p. 474:
Henry is perhaps the only commentator so large that deserves to be entirely and attentively read through. -- The remarkable passages, I think, should be marked.
Other saints from the past have taken up and highly commended this exercise. To do so once in your life, if not more, I believe, will deepen one's understanding of the Word and provide the means for much rich meditation and spiritual fruit.
It is a challenge for many to read through the Bible in one year, let alone a large companion commentary. It is not a light thing to take up such a project, and perhaps some will do so only to discover that this project wasn't for them, or distractions will overtake them in their noble effort (it is worth pondering Luke 14.28 as you consider this challenge). Yet, I think there is benefit for all to be had here, whether or not one finishes (and I expect it to take more than a year, especially as one meditates upon this spiritual feast, which requires "digestion" not speed reading). I am not setting benchmarks or deadlines, but I do plan to post devotional gems as I read through the commentary, as well as encouragements along the way.
Letter from Charles Spurgeon to his son Charles, quoted in The Autobiography of Charles H. Spurgeon: 1856-1878, p. 296:
Read Matthew Henry right through, if you can, before you are married; for, after that event, I fear that Jacob may supplant him.
Join with me, if you, dear Reader, are willing, and take up your commentary on the whole Bible by Matthew Henry, and begin reading it daily starting on January 1, 2010.
May God richly bless our studies of his Word and this devotional commentary.