I hated my Yuxin blue because the outer layers felt kind of loose and uncontrollable after putting thunderclap springs. I magnetized it with 4x2 N35 and now it's fast but controllable and stable. Additionally, now the layers doesn't missalign when I do Uu moves, wich is a problem of the stock Yuxin blue. I didn't magnetize the inner layers because I don't think it's necessary.
I have magnetized an Aolong V2 with 4x2 N35 and it's nice. I love the feeling, althrough I get the same times with the non-magnetized Aolong V2 I have. I have the magnetized one much looser, but it's surprisingly more stable. The speed it's almost the same in both cubes.
And finnally I magnetized my Dayan 2x2. I used 1x2 N35 magnets. They are extremely weak, so I used 3 magnets instead of one (I first tried with one, then two, and finnally three, you only have to glue the first one, the other ones are attracted to the glued one). I can't tell the cube is magnetized by turning it, but now I can have the cube looser while being stable and with no poping, except when I'm very unaccurate, because now it's extremely easy to take out a piece.
I think with higher orther cubes it's only interesting to magnetize some layers. For example, with the wushuang or the wuji the second layers tends to missalign when turning the outer layers, so magnetizing them would avoid this problem.
I don't see the point in magnetize the outer layers of a 6x6 or 7x7, or the middle layers for example.
