I'm sure that I do (because I seem to see them on the bicycles of most avid bikers), but I'm not sure why I want/need them.
I'm considering upgrading the stock grips on my new bike to a pair of Ergon grips. There are several models -- ones without bar ends (I think I'm using the right word here), some with small bar-ends and some with large bar-ends. For example, see the GP1 vs GP3 vs GP5 (linked below).
Can someone enlighten me?