I've looked into polishing in the past too,and really did'nt find enough evidence to motivate me to give it a shot...it basicaly came down to a battle of opinions.
Sandblaster,if you happen to notice a substantial gain,I'll give it a try....
til then,I'm still hoping to bring home that one sweat-hogg from the bar one of these nights that can put a polishin on "MY" piston crown like that!!