Oh that's good to know! I've seen some discussions to the effect that the converter was lack luster in certain cases, but they were all at least a few months old. I started a new project in the compatibility version of Godot 4 after I submitted my game, because I can't really do 3D at all let alone Vulkan (thus how simplistic my game is). And I've been loving how much stuff can be shown in the inspector now! Just jumping in definitely is the best way to see what's in store.
I definitely had super low expectations, and my scenario to be fair was a pretty simple case, still I was happy to have it and see the git diff to see the main changes it tried to do to get a sense of the syntax difference. I think it’s good at minimizing the most repetitive parts of syntax changes at least, which is a big help. Certainly it won’t be working 100% out of the box (for instance, my kinematic character was broken at first due to one of my variables “velocity” redefining what is now a built in variable for that class)