Their primary product, the Zed editor, is unusable for me and others due to it mismanaging file syncs on disk - when external edits happen, the editor retains stale state unless you close and re-open the specific file (Not even an editor reopen syncs it). There is a significant risk of your changes being silently overwritten or conflicted. Amusingly, the risk of this is increased when a file is changed asynchronously, which for me, most happens due to a pull or LLM edits!
It begs questions like: "If coding has changed so that we should use an LLM-focused source control tool, why can't the LLM fix a severe bug in our software that has a closed-form solution?"