A router with custom firmware (OpenWrt) is a basic device on my home network, but I am also using it in the business environment as a main device, and all works great.
In the past I used DD-WRT on my routers. Despite that their project is still ongoing, I found it lacking behind current needs.
OpenWrt use strictly depends on the device – router, that I am using. I always choose a device that will work for me and it will not bend under spikes of load.