Except for the times when I need to clearly broadcast a turn to other drivers (for my safety), I signal with my arm (which is most of the time).
This is principally because I am forever forgetting the signal is on. I try to remember to cover the button with my thumb when it is on, but I forget to do that too.

It irritates me to no end to look down and see the signal working away a half mile down the road.
I had other bikes with self-cancelers, and I miss that.
On the other hand, I can always remember my name.
