Great album, X/Y had a few forgettable tunes but mostly alot of really great ones! Looks pretty complete, even including stuff from the PR Videos and other extras. I like the old school stuff included in here as well.
I think the X/Y rendition of "Congratulation s on Entering the Hall of Fame!" is THE best rendition of that song that Pokemon has ever done!! It really pumps me up, makes me want to celebrate and gives me chills all over!!! Very powerful!
Some of my other favorites include Kalos, Santalune Forest, Gym Leader Battle, Routes 8-13, Geosenge Town, Shalour City, Elite Four Battle, and The Pokemon League (which seems a bit static-y on here but that's the only one I've noticed)