We are very experienced cruisers with many lines, and are platinum on Carnival. We booked the Magic inaugural knowing full well there are always kinks to work out on a new ship with many crew members new to the ship. The TransAtlantic crossing really shook her down, figuratively and literally.
The ship is just amazing. Other than the continued poor Carnival design of the buffet with long lines instead of small islands (for random access instead of sequential - duh!!!), she is an amazing step forward. Serenity deck is awesome. The widened area in the middle of the main promenade deck area with the hot tubs, BBQ and Red Frog are stunningly good and very spacious.
Room service was just horrible, but it was overloaded by all the recruisers who know it is free. On a normal cruise it is much less busy since most cruisers are noobs who never figure this out.
We had a balcony on 9. Normal carnival balcony as on any older ship. Meh.