i bought it when it was 10 cents... glad i only paid ten cents. i hated it. it worked fine if my battery was above 80% and was kinda cool, but it started lagging more and it would run slow, the thing i hate the MOST about this app is it dosnt record your "keystrokes" while it is lagging and derping out. so it would record about half of the keys i hit causing rambling nonsensical sentences. i didint like the keys either but that was my personal preference, with the stick keyboard the keys were much larger, and actually recorded key strokes if it happened to lag. the auto correction on the stock keyboard is pretty good, i was satisfied with it. and a small issue was the lack of themes they had, wish they would have more.
my brother has been using swiftx keys for the past 5 months and he has had to clear his history/memory cause every time he pressed space it would suggest something he didnt want. so the word prediction got over used, and was predicting words you really didnt want it to predict. clearing the memory every month resolved that.