Celebrity has done a great job on keeping the best of MIllenium's previous features and updating to a newer design. We were a little suspicious that it would be too much like the Edge (we were on the maiden voyage) but were very pleasantly surprised.
The April trip around Japan was fantastic - cherry blossom time, Japanese hospitality, a variety of ports, and the best weather we could hope for. We generally did our own excursions because the ports provided shuttles to city centres and plenty of maps and directions from the Japanese and Korean (two stops) travel kiosks at each port. We did one Celebrity excursion on Jeju Island South Korea which was very good.
Every port was a highlight for its scenery, city life or historic sites.