In my recent tests I found it quite smart at analyzing bigger picture (i.e. "hey, test failing not because of that, but because of whole assumption has changed and let me rewrite this test from scratch". But it also got stuck few times "I can't edit file, I'm stuck, let me try completely differently". But the biggest difference so far is the communication style - it's a bit.. snarky? I.e. comments like "yeah, tests are failing - as I suspected". Why the f it suspected failing test on the project it sees for the first time? :D