First I need to ventilate a bit about setting up the cube.
Out of the box the cube was uncontrollably loose and fast. After watching J Perm's video it was possible to set up, and once you know how, it's very easy to change the spring tension of the cube. But on my cube the springs were also rather noisy. I had to take it apart completely and lube the inside of the spring houses and then it became better, but I do need to run the cube on a looser and faster setting than I prefer to mitigate the problem with the friction on the springs causing noise. I was running the spring tension system on the firmest setting first (8) and now I'm down on 7. I guess that in the long run, I will benefit from learning that as I should be faster once I learn better control. The cube needed lubing as it it was very dry out of the box.
About the cube itself.
I like the ridges and after setup the cube became very nice. I'm still breaking it in but I have high hopes for it. The magnes have a good strength and all in all I'm very happy about it.