You know, I love the keyboard layout of SwiftKey X, but I just couldn't keep using it.
Swype is crazy fast at the beginning, but then I think it gets confused over itself and all the accidental words that were typed by somebody else using my phone.
With SwiftKey X, not only am I slower at typing than I am with Swype, but I feel like I have to think too much to use it. Typing for me is brainless. Using SwiftKey isn't, because you look up and your next word isn't there. So you press the first key and look for your word. Still isn't there, so you press the next key and look for your word. Lather, rinse, & repeat. Add to that the fact that I feel like it's trying to tell me what my next word *should* be - rather than me typing the message I want, I end up saying something else and then wondering what on Earth I meant to say...
For me, I found that deleting the cache/data from Swype every now and then keeps it accurate for 95% of my typing. Sticking with Swype.