for such a cheap price this cube is great.
it's super smooth out of the box and I think could become pretty good if lubed it up and has only popped a few times and just a piece or two at a time.
i don't think it's good enough to be a pro 6x6 but for beginners it's a good option.
just don't turn aggressively because if you do that i feel like lock ups and pops will be more frequent.

if you are just wanting a 6x6 i would definately recommend this one.

(and the stickerless shades are awesome)