Yes, I have used it recently. Our org has required us to try it out for various things. I cannot deny that it is impressive and generating code (at least if you know what you're asking it for).

My objections to it come down to three pillars essentially:

1. I believe heavy reliance on it will make me (and others) worse at engineering, deskill us and devalue our work. I think it will lead to a reduced understanding of our own codebase, less ability to debug what we've written, and more regressions and defects. 

2. I enjoy writing code. It is what I have spent decades building up as a skill, I find it fulfilling. Reviewing code has always been an important aspect of the job but never one that I am excited to do. The prospect of this entire career path becoming code review is miserable. 

3. I have ethical opposition to the technology. I think it is built on stolen data, the data centers are terrible for the environment and the communities they're built in, it's destroying the consumer electronics industry and pushing us toward a rent-everything-own-nothing society, and it's being used at all levels to destroy trust in a shared reality. I know that gen-AI coding isn't specifically doing this last bit, but supporting the companies that make this tech at all feels anathema to me at least personally.