I actually really like the stock multi-touch keyboard. I find that I'm far more accurate with it than with any other keyboard I've used, including Swype (with over two years of Swyping experience), SwiftKey X, Thumb Keyboard, and FlexT9. It just works better for me on the MAXX than anything else that I've come across.
I love the features of the Go keyboard but it really does not seem to learn your words like the stock one did or flext9. I'm giving it a bit more time but I may switch back.
The ICS and Gingerbread keyboard I used on my Droid 2 were pretty good on the smaller screen. But now on the MAXX the default really shines with the extra real estate.