I've tried to get used to Fleksy mutliple times, including within the past week or so when it became a free app (though I'd paid for it previously anyway). I reallly want to love it and use it, because it's the only keyboard app that has that BlackBerry style layout (the second alpha row is flush to the sides of the screen). That makes it a smoother typing experience for me...until I miss the predictive text of SwiftKey.
Each time I've tried Fleksy, I wind up back with SwiftKey in short order. I've offically requested a layout for SwiftKey like the Fleksy/BB layout, but I'm not hopeful. All their themes are the same layout with different colors and such. None of them alter the layout of the keyboard. SwiftKey did make the BB touch keyboard, though, so...
Anyway, Fleksy is just fine by me. I recommend people try it out for sure.