I’ve got one. Got one camera on the house not far from the base station and the other watching the garage at the top of the garden, at least 20 metres, probably more like 30 from the base station. It seems to work well. I got an alert while at work the other day because a little bird had found it’s way into the garage.
The batteries will obviously cost money to replace but it makes the setup a piece of cake because there’s basically zero wiring. I say ‘basically’ because our base station is on the network via a cable plugged in to a WiFi range extender. But other than that, just plug in the base station to a power socket, turn on the cameras and away you go.
If you set your schedules up right and the camera is somewhere quiet (I.e. you’re not using it as ‘always on’ CCTV in a shop) then the camera should only come on when something unexpected happens, like my bird, which means the battery power isn’t an issue.