Quick comment on bonus items. Outside of the audio commentaries, AoA is including everything on the JP copies. There were no booklets, only production material collections (storyboards, original drawings, art boards, etc), which AoA tends not to include, so AoA couldn't add a booklet to these sets. Volumes 2, 4, 6, and 8 included drama CDs, which were incredibly unlikely to come over here. V1 had the remix/rearrange CD, V3 has the first Trigger production DVD (look for this in AoA v2), V5 has OST 2 (look for this in AoA v3), V7 has the second Trigger production DVD (look for this in AoA v4), and V9 has the third Trigger production DVD (look for this in AoA v5). The only other bonus disc that may be included would be the English cast interviews that'd replace one of the Trigger production DVDs most likely and/or AoA conducting their own interviews with staff members.
The bonus discs are likely why AoA split this into 5 volumes and why other countries get 3. Just a thought for reference.