I purchased the Tyndale 20 volume NT commentary which was included in one of my library collections over the past month, but I received received a recommendation from Logos shortly after that the 1 Peter commentary volume needed to be purchased because it was the only commentary of the 20 volume set that I did not own. Naturally I wanted to own a complete set so I took the Logos recommendation and purchased the missing volume for $8 more……… only to find upon searching my library a day later that I now have 2 volumes of the 1 Peter commentary with only one difference one (the new purchase) being a revised version. As a new subscriber to Logos I find this purchase recommendation to be very confusing and slightly misleading; however, I also fault myself 50% for not researching my library thoroughly before making a new purchase.