What exactly does it isolate? An SSID? IP addresses? individual MAC addresses? How does this stop a pre-infected device you purchased from shitting traffic out of your network, acting as a residential proxy or try to own your other IoT devices?
The one I've seen on ~basic consumer routers just disallows wifi devices from talking to each other at all, it won't route between them. I usually need something more nuanced personally, but it's not a bad start at all.
