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.
As soon as FUTO gets a split layout, I'm definitely switching over, if for no other reason than the slider for how aggressive auto correct is. I'm so sick of Gboard constantly correcting the word I meant with one that doesn't make any sense.