I've been very impressed with the in-depth analysis he goes through with each piece. I have just downloaded the free (with membership) book for the third level, and have begun to work on the first piece. He is continually adding material to the site.
2015 German Vazquez Rubio "Estudio 640" SP/PE
2012 Kenny Hill New World Estudio 640, SP
2016 Kenny Hill New World Estudio 640, C