It has its uses.
Like most bespoke items they’re good at some things, not everything.

It’s nice if you’re trying to keep an indoor living space warm for a longer period, like overnight.

They typically have a thermostat setting on it to maintain the temperature.

It doesn’t make the same noise as a blowing space heater, as there’s usually not a fan. I’ve heard creaks and such from them.

As noted, the radiative effect can last for a few hours depending on energy loss in the space.