Very good cube, my second 4x4 after a piece of rubbish I used a while back. The inner magnets are a bit too strong, it's an odd thing to say but I took out the second magnet in each edge to sort of fix that, it's a very smooth cube and decently fast but prone to locking up, then on the reverse end of the spectrum too loose and I find plenty of internal pops. Would recommend loosening it by about a quarter or half turn before using, if you have the time then taking some of those magnets out is worth it but it's a bit tedious. A great cube though and excellent for the price.