I bought the Moyu WRM V9 20-magnet ball core as a potential main. Regular price for the WRM V9 is $38. I performed 500 solves on this cube before posting this review. I purchased SuperNova service from SCS and have added Lunar lube once. I have the cube set up on adjustment "9" (loosest), with the spring backed out about a half turn.
PROS
Smooth, clacky and quiet compared to the RS3M V5 during metronome exercises, getting progressively more clacky as the TPS increases. Corner cutting is excellent, and the cube really rewards fast turns. It will forward corner all the way past 45 degrees (55?), and backward cut at about 22 degrees at my settings. I prefer UV coating on stickerless cubes, and Moyu's coating is as good as, if not better than Gan's. Removing the center caps is easy to do without tools. The plastic feels very nice providing a muted sound, and twisting is very forgiving. The price I paid for this cube represents a good value for a flagship cube.
CONS
Adjusting spring tension requires a screwdriver (provided) and other tension adjustments require the provided tool. Magnets are not adjustable, though they are strong enough to provide indication they are working. There is very little auto alignment effect. Being picky, the corner magnets may be too strong for my feel, causing pinky tricks to take a bit more effort. Initiating turns on the WRM V9 takes more effort than on the Gan 12 or Gan 15.
VERDICT
This is a very good cube. I rotate this cube through about as often as my other mains (Gan 12, Gan 15, Tornado V3) and I find twisting it rewarding. On my turning feel ranking, I currently have all my mains, including this one, as 10s, though this is "least great?" of my four mains. All of my mains have very similar AO100 times, however, on algs that require pinky tricks, I have to concentrate to make sure I initiate the turn far enough. I do prefer my Gan 12 or Gan 15 over this, but that is just feel thing, since I prefer light and fast over heavy and blocky. This still easily earns five stars on its own merits.