I have been using this app since the $0.25 sale a few months back. I'm a pretty accurate/slow tablet/phone typer, so for me, I can't boast how great the app is at correcting my mistakes. However, I do think it's predictive suggestions are much better than Jelly Bean's keyboard.
I also like the ability to change the keyboard theme, but miss the numbers across the top (I'm used to it now, though)
I didn't know about the update until the OP made this thread. I went to the Google Play store, clicked on install and updated my tablet and phone to the lastest version and have Flow now.
The fastest thing a computer does is become outdated. -Andy Rooney
From each according to his ability, to each according to his need. -Karl Marx