i think cursor is the only player that forked vscode. i've been using cursor for a week and i really like it. it's able to auto complete/correct code in multiple places at the same time. other copilot extensions in vscode were not able to do this. but i assume microsoft will quickly add this feature in vscode and others will catch up soon. i don't know if it's a true advantage to stay as a fork of vscode.
The fork is what put me off so I use Codeium that seems to do an excellent job. It has saved me a lot of time especially in "convert from React to HTML" or "Use this field list to define a table" type tasks. The more autocompletey end of things rather than intelligent.
The practical issue of a fork for me is .NET won't debug on a fork, but that is probably a niche issue overall.