edit: after breaking in for a couple weeks, it feels much better. the middle layers feel still kinda scraping but it's much less noticeable than before. my tip would be to hold the cube and turn the half the cube with your wrists back and forth maybe like 20 times. You can also do some 2x2 solves to get the middle layers moving.
I don't know if I got a bad unit, but it came incredibly dry and incredibly tight. had I not had lube, it would unusuable. Even after lubing and loosening slightly, the outer layers still feel clackity not smooth, and inner/wide layers feel like they're rubbing hard against something inside
while the magnets are not weak per se, they don't feel substantial enough for me to feel comfortable loostening the cube any further