So now I have tried it, and you should get the MGC. It comes quite dry and really fast out of the box, but even with that I was only getting 2-3 seconds slower than normal times on it. Then I lubed it with quite a bit of 50k in a way that was extremely similar to the way I set up my wrm, and tightened the cube some. It is now almost identical in feel to the wrm, although it is slightly more sluggish since I haven’t quite broken it in yet. The general difference is that the wrm feels more solid and limited while the MGC is more flexible. The MGC has stronger outer layer magnets (which I like) and is slightly larger (which I don’t like). The wrm is about equal, and any advantage it may have is not worth the extra $20
Edit: and they got rid of that awful shade of green from the 6x6.