HD streaming is works, but I'd say 80 percent as stable as a Roku.
If you're running everything thru a router you should be fine. Individual device thru a vpn or dns and then streaming into chromecast will not work.
Related question: has anyone replaced a pccw router with their own for vpn purposes? I have the 300 service and it's fiber in to their Huawei excuse of a router.
Yes, because your entire network runs through a vpn set up router level.
It's an open source "apple TV" at a 3rd the cost