Very customizable (I like having number row always visible, and having long press for symbols on each letter).
Has gif support built in.
My biggest pain point is:
It auto corrects words that are spelled correctly to other words. I type "our" and it changes to "out", I recently typed "purpose" and it changed it to "purple". Autocorrect is awesome and necessary, but I hate that it corrects words to other words and not just typos. I wish I could find a keyboard that has the things I like without this annoyance.
I want to like futo but I think it just needs more time. I'm using Gboard without the Internet access turned on (I'm using graphene OS) so I'm not worried about Google knowing anything I type.
I mostly use the swipe to text feature and I just haven't found another keyboard that does it better than Gboard (unfortunately)