Currently just use it for backing up KeePass and uni files across two laptops and a phone.
I think it would be fun to use it for storing DRM free games (like from GOG) and sharing them with friends. Create a big dump of games and share them with each other. Maybe even share save files in games where that's common.
I tried out 3 apps total and even with it being a little stuttery, Jerboa has been my favourite so far. I like the layout of the interaction buttons for comments as well as the ability to jump from one comment chain to the next or previous.
I found Thunder to be a very smooth experience but really didn't like that you need to swipe comments to interact, and that the distance you swipe determines whether you upvote or downvote or etc. Perhaps there's a way to change that in the settings but I couldn't easily locate it.