I've been using LR12 since it first came out. I really like the upgrades to the masking tools --- it speeds things up a lot. If the auto-subject mask doesn't work, then you can just brush over something and the AI will figure it out very quickly from there. The only thing that I've struggled a bit with is the content-aware removal tool, which rarely works for me. The tool could be a bit flaky, or maybe I just need to read the instructions and find out how to use it properly .