I finally rolled back up to CM4 and Grbl 1.1 a few weeks ago. Absolutely thrilled that 10-key support has been fixed, which was my big beef with the earlier releases. Really liking the feed over rides as well. Other than the way the GUI works (“end jogging” button is really annoying) I no longer have any reasons to not use it. Would be cool if they added some macro support so I could save more than one zero X/Y/Z so I could reused fixtures without keeping notes. All in all seems pretty stable. I crashed my cutter one time, but that was due to a really tall piece and my gcode caused the Z to retract higher than physically possible, belt slipped, bit came down crashing into work(wish “homing” switches where also “limit” switches). All in all though, despite a few hiccups (on my part as well), it’s a good build.