Same position, different results. I'm maybe 20% faster. Writing the code is rarely the bottleneck for me, so there's limited potential in that way. When I am writing the code, things that I'd find easy and fast are a little faster (or I can leave AI doing them). Things that are hard and slow are nearly as hard and nearly as slow when using AI, I still need to maintain most of the code in my head that I'd need to without AI, because it'll get things wrong so quickly.

I think what you're working on has a huge impact on AI's usability. If you're working on things that are simple conceptually and simple to implement, AI will do very well (including handling edge cases). If it's a hard concept, but simple execution, you can use AI to only do the execution and still get a pretty good speed boost, but not transformational. If it's a hard concept and a hard execution (as my latest project has been), then AI is really just not very good at it.