snow_bound2041166wrote a review of Wolf Tooth Components WolfCage and Giant Cog Kit for Shimano 11sp on September 29, 2019
I'm giving the product itself 5 stars. It deserves it. Well made, easy install (with the right components) and you can see they put thought into the design.
My issue is in Backcountry's item description. Says compatible with Shimano SLX GS rear derailleurs. It is not. The Wolf Tooth cage doesn't line up. The mounting holes for the cage are 4mm too short. I have looked all over Wolf Tooth's website and can't find any mention of it being compatible with the SLX derailleur. And unfortunately you need their cage to clear the large diameter of the cog.
Get this if you need it to round out your drivetrain just make sure you are using either an XT or XTR derailleur.