This is a pretty great rotating bookcase and hold so many books! Once books are on it, you have to be a bit more careful turning it slowly, but so far so good. I also only built 4 tiers instead of 5, like some of the other reviewers. It's a little too tall for my liking when up to 5 levels. I'm considering getting their 3-tier bookcase to make another 4-tier bookcase with my remainder tier.