I bought swiftkey ages ago and didn't really like it. Every now and then I try it again, decide I don't like it still and go back to stock.
I've been trying a new ROM, which although is great doesn't have the standard stock keyboard, so I try a few alternatives, none of which are very good, and eventually decide to try swiftkey again, the main reason I didn't like swiftkey was the size of the keyboard and the fact you counldn't swipe the keys.
I think I have just found my new standard keyboard, it's fast, gets most of the words I'm going for and now has resizable keys. Oh and the swipe over the spacebar for a new word works better than I expected it to. Very happy, love having the choice.