The keyboard has a natural feel to it, and it was fairly easy to adjust to from a standard keyboard of this size and shape. The rubberized keys were a bit of a surprise, but haven't had any problems with them, and it seems to keep gunk from getting inside them. The matte black rubberized finish is also a nice contrast to the white keys and orange 'alt' keys, and helps to make the keys stand out when backlit.
I find texting/IMing and entering text as a whole to be mostly pretty easy. The CAPS, Alt and 'Symbol' functions are easy and obvious, and a cursor indicator lets you know when you're in a 'onetime' or permenant mode (meaning every time you type, it's either caps or 'Alt', depending on what you've selected).