I'll piggyback on this one. Ron Hickland has also done the same, but went a bit further, in comparing the NU Blue Hammer, Purple Hammer, Blue Tank, Pitch Black, IQ Tour 78U, and an AMF Sumo, then compared all of those against a Storm DNA.
Also for S&Gs, he polished up a Radical Double Cross to basically show why we don't polish them up anymore like we did back in the day with the Blue Pearl, Red Pearl, and Pink Hammers.
He then attempted to polish those balls to show something about what is urethane and what isn't urethane, and some interesting revelations came out with some of the newer releases.
Very educational, especially along with The Black Bottle.
BL.