For an earlier discussion of this 14-CD box set, see this thread in the main Frank Sinatra room (from where this post was copied):
"Frank Sinatra: The Concept Albums" U.S. TV Offer
<< is this set a necessary purchase? Has the sound been improved [...]? >>
There is nothing new here in the way of recorded material or improved sound. If you already own the Capitol concept albums on Compact Disc--either individually, from the 1987-1991 issues or the 1998-2002 Entertainer of the Century reissues, or combined, in the US Concepts or the UK The Capitol Years box sets--then this set is redundant. Otherwise, it's a great collection at a bargain price of less than half that of the other packages.
Note that, unlike its earlier US big brother, it comes without a substantial book. Also, like the British box, this one does not include A Jolly Christmas or Tone Poems Of Color. The British set is still preferred for (most say) better mastering and the inclusion of more music (the singles compilations such as This Is Sinatra and the extras in The Rare Sinatra).
In short, this is a fine collection at a budget price. Unnecessary for some, but a good buy for many.