If you don't make yourself busy with eating or chatting with your friends or family, you might get airsick(?). Even if it moves slowly you will still be able to feel it turning and see the changes in scenery. Even the location of the buffet from your table, the entrance and toilets will all change.
Since we just came from a breakast buffet, it was hard to appreciate the food they offered. Some of them were the same.
From what I tried I like the lasagna, roti, chendol, cheesecake and the pulut. I didn't try a lot as I just ate a hotel buffet three hours ago. My sister liked a lot of their offerings though, especially the salted squid.
P.S. Don't leave your bag on the platform near the window, as as you might think someone stole your bag, when you leave to get your food, as it doesn't move with the dining floor.
P.P.S. When you dine at Atmosphere 360 you'll get free access/entrance ticket to the KL Tower Observation Deck. Not that you will need it as you can already see everything. But it's still nice to know more about the history of Kuala Lumpur.