No doubt this is by far Samsungs best efforts at a keyboard in quite some time but it's still nowhere near as good as SwiftKey. I guess people tend to forget that the more mileage you log with SwiftKey, it only gets better.
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Swiftkey is great except for Flow.
Flow just doesn't work with their prediction algorithm. They keep "predicting" what I mean to swipe when it's not what I want. For example, it doesn't always get "too." It doesn't register the second 'o' because it's trying to predict for me my next word more than it is recognizing my swipes. This works great for tapping but not so much for swiping.
For example, Swype allows you to clearly swipe two consecutive letters in a row and it registers that as such.
They really need to fix Flow. If you visit the Swiftkey forums there's an entire thread of "Impossible to Flow" words ("too" being one of them. "It's" is another one).
I'm an avid Swiftkey fan but Flow needs serious work.
Whereas other keyboards like Swype or Kii or the stock Android keyboard may not have the best predictions but they work so well overall that it's forgivable.
I don't really know anything about the Samsung keyboard, though.