I like keyboards with those half-height keys. I don't use arrow keys much, so it's nice that they don't take up so much space that other parts must be compromised.

I really don't like this design though where the left/right keys are full size (or other designs where they put things like page up/down buttons above the left and right buttons). I don't mind that the arrow keys are a squished inverted T shape, but I really do think they should get to be an inverted T shape. When I do want to use arrow keys, I want to be able to easily locate them by touch without looking down at the keyboard.