PeelingStickers
Veteran
Aaaah, I was slightly rushing when I wrote that review and so didn't come to any conclusions 
I switched back to the fangshi core in the end because on the dayan core one side would unscrew itself (I'm not entirely sure why but I believe it's because of the lack of threading on the screws). This is further amplified because the dayan core is so much easier to screw in. Try it out if it suits you but personally I don't see much of a difference in changing cores.
To clarify a little further about my opinion on the cube:
The cube is very light. I haven't got around to weighing it but it's probably about 2/3rds the weight of a zhanchi and maybe up to half the weight of a standard rubik's. The problem some people are talking about is probably that the cube locks very much. This I can agree with if you've come straight of a dayan cube. I agree that by speed it's about the same as some of the faster dayan cubes (zhanchi/guhong/lingyun v2), however the point I'm trying to get at here is the weight may make some cubers try and speed up their turning because they think it will have benefits. Sure this works if you're transitioning from a rubik's to a dayan, but this cube can snag if you're not careful. Corner pieces and even centre pieces can twist. I sometimes get lockups on this cube that I cannot explain as it seems to lock at a very low angle. It must be internally. I would suggest actually slowing down your algorithms on this cube if you're a sloppy turner.
This may sound a bit negative but I'm just addressing some of the few cons I could find. I find my F2L to be a couple seconds faster on the shuangren than on a zhanchi. Algorithms may be a little slower to execute but that's only marginal. I find that if you do many solves in a row you will get more used to the cube, and that is where you might see the improvements coming
I switched back to the fangshi core in the end because on the dayan core one side would unscrew itself (I'm not entirely sure why but I believe it's because of the lack of threading on the screws). This is further amplified because the dayan core is so much easier to screw in. Try it out if it suits you but personally I don't see much of a difference in changing cores.
To clarify a little further about my opinion on the cube:
The cube is very light. I haven't got around to weighing it but it's probably about 2/3rds the weight of a zhanchi and maybe up to half the weight of a standard rubik's. The problem some people are talking about is probably that the cube locks very much. This I can agree with if you've come straight of a dayan cube. I agree that by speed it's about the same as some of the faster dayan cubes (zhanchi/guhong/lingyun v2), however the point I'm trying to get at here is the weight may make some cubers try and speed up their turning because they think it will have benefits. Sure this works if you're transitioning from a rubik's to a dayan, but this cube can snag if you're not careful. Corner pieces and even centre pieces can twist. I sometimes get lockups on this cube that I cannot explain as it seems to lock at a very low angle. It must be internally. I would suggest actually slowing down your algorithms on this cube if you're a sloppy turner.
This may sound a bit negative but I'm just addressing some of the few cons I could find. I find my F2L to be a couple seconds faster on the shuangren than on a zhanchi. Algorithms may be a little slower to execute but that's only marginal. I find that if you do many solves in a row you will get more used to the cube, and that is where you might see the improvements coming
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