There's a pretty noticable difference between both disks of the album. The first disk is called Fragment [Vein]. The songs on this disk remind me of somewhat of "Shiver" and "Pledge" (from their previous album TOXIC), which are quite good songs, but have never been among my personal favorite GazettE songs. I felt the same way about some of the songs on this disk. I love "歪" though and "ヘドロ" has really grown on me. "余韻" has a gorgeous dark sound, too.
Disk 2 is called Fragment [Artery]. It definitely has more heavy, driving songs on it (which are what I generally tend to favor). It also has some electro sounds mixed in. This disk has my personal favorite song from this album, "Gabriel on the Gallows" on it. I love the chorus and it's got a great heavy sound! My other favorite song on this disk is probably "Dripping Insanity". It's got this dark sound that I find really appealing. I wasn't quite expecting it, but once I got used to the electro sounds, I really started to like "Derangement" too.
Both disks are bookended by instumental intro and outro tracks. I think that they're a nice touch and really add to the feel of the album. I really like the end tracks for both disks. "Diplosomia" starts off very quiet and haunting sounding, then BAM- electro sounds! As for "Melt", I really love the beat.
Overall, DIVISION is a good, solid album. For whatever reason, I didn't fall head over heels in love with it right away like I did with DIM, or TOXIC though. It's taken a few more listens, but I'm finally starting to fall in love with it. I'm excited to see the band perform the new songs during the tour this fall. I'm sure that (if I haven't already) I'll fall even more in love with this album when I see GazettE perform it live!