Run-of-the-mill single-tap text entry
This is actually a very important feature that a lot of these predictive type keyboards miss off.
Swype drives me mad when the word you are tapping in letter by letter is not in the dictionary. It pops up a box with ridiculous suggestions along with your typed in letters and you have to tap to select. This is especially bad when you are typing in a password as the the suggestion popup which also contains the password you've just tapped is visible to anyone sitting next to you. Flext9 just lets you individually tap the letters and numbers unhindered.
My only beef is there is no trial version. So you've only got Google's ridiculous 15 minute refund window to decide whether you get on with it or not.