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 Premium is a very stable cube, stable meaning it keeps its cube shape. If I had to guess, that is the main thing the cap magnets provide. The cube is controllable and provides even greater stability with stronger cap magnets. I own the Tornado V3 Pioneer, and this cube is comparable to that feel and speed.
There are a lot of options for customizing the feel, from making the cube faster by taking the cap magnets out to all the other options in the description to slow it down. All in all, this is a really awesome cube.
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.