There's still some things I'm waiting for, such is the life of using a platform that's still in development by a small team. Some way to organize my grains is the big one left right now. But especially recently a lot of the stuff "down the roadmap" is starting to feel finished. The Powerbox features are getting there. Active Directory integration exists now.
Since somewhere in 2014 when I started playing with it, it's always felt like it was moving forward.
If a folder structure will be implemented, sharing options should also be available for folders, I think.
Most unique use case of mine: my phone runs Owntracks which logs location data for walking around the city, vacations, etc. I obviously don't want _that_ on google, but am slightly more comfortable storing it in a self-hosted Sandstorm instance.
Huge fan. I also hope to create my own sandstorm apps when I get time.
Once in a while I spin up an Etherpad grain for a meeting.