We gave the cousins all eight volumes for the holidays and were told they were the same smash hit there as in our house. Everyone we have ever mentioned this to, has come back and thanked us. Osamu Tezuka created ASTROBOY and for that he will forever be thanked in our house (where would robot culture be without Astroboy?!!).
Tezuka's masterwork is The Adventures Of Buddha. Sure, it gets a bit racy at times, and it definitely gets silly. Some adults may quibble at the liberties taken, but the story and the drawings are fantastic. But the whole reading experience and sense of accomplishment one has on completing the eight volumes is unmatched. Suffice it to note that we finished all eight in between Harry Potter 2 and 3.