One problem I do have- sometimes when I quote people, all kinds of random letters appear. Words start mixing together. When I try to delete them, it just makes things worse.
I get this a lot. It's best not to even attepmt to use the suggested words on the keyboard, as that seems to be what screws it up. The only other complaint I have is responses on the articles not formatting right. The original comments are fine, but the responses are mainly offscreen unless I have my phone horizontal.