I personally use the swiping keyboard on ios and it seems to detect the wrong word with an almost malicious frequency. It also randomly Capitalizes things.
But it was a favorite for a while.
Considering that Microsoft bought Swype, I have no idea why SwiftKey isn’t absolutely amazing, but it isn’t.
I think it's slightly worded if you swore. No. Slightly worded. No. Slightly worse if you swipe left handed. Yes. At last.