Dayan has made two great cubes in the Premium and Fancy versions. They are very different puzzles, so it depends on what a person likes better in a cube. I'm writing a review for both of them, so if you are on the fence, it's worth reading both.
The Fancy is a very flexible and fast cube. It has never popped, and it corner cuts really well. The flexibility can cause it to lose it's shape, so if you grip your cubes hard, you might have trouble with this one.
To give it a little more stability, I put the cap magnets from the Premium onto this one and it gave it the stability I wanted. So if you get both cubes, there are a lot of possibilities of customization. The speed is amazing, and most cubers could probably set a PB with it.
Is this cube better than a Gan or Moyu? I don't think so, but is it comparable and will a lot of cubers like it better? I think that could be true if this cube was given the chance.
Is the Zhan Chi going to pull cubers away from other brands? Probably not, but if you want to try a great puzzle that is a possible main contender, this is a good choice. Dayan made a heck of a cube, and I hope it becomes more popular.
As a final personal testimony, before the Zhan Chi I was not a big fan of 3x3. I preferred bigger cubes. But the feel of this cube is so good, that I now solve 3x3 as one of my main puzzles. This cube is definitely worth a try.