The turning itself is super smooth, it the pieces glide over eachother without any effort which makes it a very fun puzzle to turn. But, it has 2 major problems, the core doesn't have a fixed center, meaning that the long layers, can get misaligned and refuses to turn. The second problem it has is that it pops a lot, I tightened it a lot, and now it seems semi stable, but the misallignment is still there and quite frankly, frustrating.

Good turning, but had misalignment issues like on a 4x4x4 without center bumps. I'm trying to fix it though.

Great cube and very fun to solve. Not too hard if you can solve 2x2x3. It turns nicely and smoothly. I'm very happy to have it in my cube collection.