while this definitely makes the outer slices much more stable, it also makes the magnet strength of the whole puzzle a lot higher than it should be. The inner layers feel actually heavy to turn. a mod or feature like this could work in a 4x4 with weaker magnets but the MGCs are too strong.

I usually set up my cubes to be on the slow end and I prefer stronger magnets so for me its really good. The core magnets aren't going to make your cube auto adjust like the Gan 13, but you definitely feel it when turning.

There are only 2 problems I have encountered consistently. First problem that comes up sometimes is some sort of catching issue. Im not sure if it is an MGC thing or if its the core magnets but I double checked that the magnets are flush and the core was installed correctly and it is. But, I still experience a weird catching issue when turning inner layers sometimes. It feels like it might go away over time from the plastic breaking in so I wouldn't be to worried about it. The biggest issue I encounter has actually ruined solves completely and I haven't really found a solution. Sometimes when you try to do a wide move (like when doing the wide U2 in pll parity alg) the cube decides to pull a Rubik's and ONLY turn the inner layer, leaving to outer layer where it was. So after the pll parity alg, Ill have centers and edges misplaced and dont know how to put them back quickly so it ruines the solve. I enjoy the magnet strength but I also really like very strong magnets so keep in mind these do increase the magnet strength considerably. I also wish they could find a way to make these non permanent so you if you put them into your puzzle and hate it, you don't have a useless $30 paperweight.

This kit is quite easy to install. After the cube was assembled, the magnets were to strong and was turning the inner layer itself without turning the top layer. After lubing with fast lube and making the tensions looser, the cube was so good. This kit makes the mgc 4x4 better than the aosu 4x4 imo.

This thing is trash. It all started when I was putting it together. The magnetic core part broke, and I had to glue it back together. Then, when I put the cube back together, it was catching all over the place, and the reason for that was that the magnets were bulging out. One even came out. So when I was putting it back together I noticed that one of the magnets were repelling. Turns out, I glued that magnet that fell out on the wrong polarity. And because it was super glued back on, there was nothing I could do. I know I should have checked the polarities, but these problems wouldn't even happened in the first place if the quality was just better. Now my MGC 4x4 is ruined. Seriously, don't buy this kit if you want to keep your MGC 4x4.

This mod started out great, but it quickly devolved into a wide array of issues that included loose magnets and magnets that were way too strong. The mod also ended up damaging my core. Don't get this until they do more testing!

Worked good, but i bit too strong, then it fell off. I re-glues it 2 times, and it still fell off.