I have been using Claude Design + Claude Code, and results have been excellent. I have explicit clean-up instructions in Claude Code, and the handoff skill in Claude Design is pretty solid.

I've been on product launches many times, so can drive the design side appropriately and keep things focused. Has been a wonderful addition to my workflow.

As usual with any agent-driven tool - GIGO. If the human driving has no product experience and is blindly accepting designs, well, that's... a choice.