I do! It's more my dad's hobby than mine, but I have a couple of Meshtastic devices - one of which is permanently on in the attic with a reasonably large arial attached to it

There's loadz of nodes around these parts - to the point where I can talk to the next town over despite the big hill in the way - but most people you'll find on there are the usual middle-aged radio geeks and ex-CB radio users. And of course, most of the messages in the public channel are just test messages