This book displays the ideas of how to apply the melodic minor scale, through the means of scalar sequences, static chord vamp, ii-V applications, arppegio superimpositions, pentatonic fragments, etc. From learning these ideas, one should be well equipped for further exploring into the study of this scale, which is essential in jazz music.
In terms of technique, to be able to play the phrases, particularly the wide intervallic ones in full speed that Don demonstrates on the CD, obviously requires good technique, or at least will lead to the development of your alternate/sweep picking technique so as to accommodate some unusual runs within certain phrases. In this respect, the licks and phrases in this book can at times be quite advanced.
The most useful units in the book have to be the four usages (2nd, 4th, 5th, and 7th mode of the scale) or substitutions, though the 6th mode is briefly showcased as an alternative to the harmonic minor scale in a minor ii-V progression. The demonstrated licks fuse together in general a traditional jazz sound (e.g. the "Gone but not forgotten" lick frequently appears, cf. Jerry Coker's Elements of the Jazz Language for the Developing Improvisor), arpeggio superimpositions, modern runs in 4th/5th, and wide intervallic jumps. The licks are inspiring and should help build a good foundation for developing the usages of this scale.
Interested guitarist may also want to check out Don's Artful Arpeggios: Fingerings and Applications for Guitar (REH Pro Lessons), Joe Diorio's Intervallic Designs for Jazz Guitar: Ultramodern Sounds for Improvising and Steve Khan's Pentatonic Khancepts for furthering the study of these areas which the current book has presented on different levels.