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I did the same upgrade (Scholars to Scholars Silver) a few days after Logos4 came out and it is worth every penney! The extra commentary resources alone are worth the cost, however they are many other great resources you have not had until this point.
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I have used the NAC regularly since the first volume came out. I largely agree with Russ Quinn regarding the strongest volumes - although I would personally add Matthew as well. I have found them overall very much worthwhile, although not the most outstanding in any area. Other commentaries are more technical and have more original language information
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I got the iphone app four days ago. Got an upgrade to Logos 4 Silver downloaded and going strong today. However, the books on my iphone app are not syncing as I believe they are supposed to. They show up, and I can read them. However, if I understand correctly, the books I have open on my computer should be open when I open the iphone app and that isn