Been using it for about 16 years on TP Link, netgear, and now GLInet routers - its great.

The only one I ever reflashed back to stock was the netgear and that was mostly a temporary experiment.

I love having Tailscale running on it so I can access my LAN from anywhere and use it as an exit node.

Edit: I probably started with DDWRT on a Linksys... Forget if it was DD or Open WRT on the TP link.