Well just to make it clear, as the name implies these are alternate takes of Lester Young performances, from various labels.
There is "Lester Leaps In", "Dickie's Dream" and "Shoe Shine Boy", on this one of course but when I picked it up what it seemed to have the most were unique alternates from the Commodore sides: "Way Down Yonder in New Orleans", "Countless Blues", "Pagin' the Devil", "I Want a Little Girl" and it didn't seems these alternates were easy to come by .
Sound is quite good and would probably appeal most to someone who has only the master takes.