I tried ASK and wasn't a fan. Unless I'm missing customization options, it lacked the ability to change long press times, there's an obnoxious empty space above the keyboard, and it was quite poor at auto correcting words that were supposed to have apostrophes. You'll have to change your bottom row to get the space bar a similar size to Swiftkey (I missed it a fair bit before doing this), and it doesn't have the hold space bar to move cursor either.
I get that using a different keyboard is going to be an adjustment, being a convert to Colemak, but this one seems just a bit too rough around the edges for me.
E: found the long press adjustment, but now can't find how to add long press symbols to the keys...maybe I'm just too dumb for this keyboard
E2: Actually, after more messing with it, I'm going to give it another go. Still missing the long press symbols, autocorrect apostrophes, and auto space placement after adding commas and periods though. We'll see how long I can put up with that.