The right shift knob feel

[wdkwang]

The 370 is my first stick shift and currently still rolling with the stock knob. To me, it feels very comfortable because it conforms very well to the natural shape of our palms. And it being leather, it stays relatively warm in the winter and doesn't burn up in the summer.
I want to ask those who have aftermarket knobs why they change their's out?
A common style I see is the Nismo titanium knob that looks like a metallic cylinder. It definitely looks nice, but I can't imagine it being as comfortable to use as the stock one; and so on with the other aftermarket ones I've seen.