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I'll jump in and second that! I got one and switched to a three point Y Axis bearing setup and it eliminated a lot of binding present with four bearings, and DID improved the leveling, but I still had some leveling problems.

Then I went to a 3 point leveling system on the bed and it totally handled my nightmare 1st layer issues. Just dump the back right corner thumbscrew assembly. I discussed it here: https://www.thingiverse.com/groups/i3/topic:19008

That, combined with this plate, gave me a dead level bed. Recommended.