So, I've had this for about a week now, and I can confidently say that this a stellar 5x5! When I first got it, it was a bit too loose and kept locking up. Once I tightened the cube, it became a lot more stable. Now that I've also lubed this puzzle, I can turn it quite fast without fear of lock-ups or pops.
The magnets on the inner layers are a bit stronger than the outer layers, which I find great! I find this allows for more speed during 3x3 stage without having to worry about the inner layers coming out of alignment. Turning the inner layers during centers and edge pairing is quite enjoyable and I don't have any issues with the inner magnets being too strong and making the turning too hard.
This is a great product and well worth the high price. It's quite smooth and fast, which, for 5x5, is a great benefit! I enjoy this puzzle and find it a lot better than any of the other 5x5s on the market!