I haven't even begun to explore what all can be done with it, but from what I've gathered by watching fiatjaf's in action, it's powerful. I've been so happy with the inbox, after struggling with unstable replies and useless notifications for a few months prior to switching. Everything is consistent and clean now.
The best part of it is how easy it is to set up an instance. I needlessly complicated things by subconsciously thinking there was no way it could be so easy. Even after creating a little mess on setup, i had more struggles with the VPN provider than the software itself, by far (which i think was more related to my choice of provider than anything).