Ruff is super nice, the speed increase means that I no need to wait a second after saving a file to make sure my linter or formatter don't confuse me.
Python packaging is kind of a mess where each tool that solves a problem also feels like it bogs down the process. It doesn't help that I need multiple tools to manage both my python and package versions. It sounds like uv isn't far enough along for me to bother with yet, but it also has a goal and team behind it that make me optimistic that this isn't just another packager to throw on the pile.