Got the dominator beaters today, crazy fast shipping only 2 days! First impression, they look crazy awesome! very shiny, makes the pedal a whole lot more unique. Weighing the old DW beater against the Trick there isn't a ton of weight difference, the Trick is lighter because of how much aluminum is milled out of the center. I went ahead and swapped out the beaters and set them up for the center of the kick (BIG plus is the telescoping head, any pedal i've ever used the beater has never been able to go low enough to get to the center of the head). I started playing an immediately noticed a difference. Much smoother action and better response. The lighter feel made it necessary to tighten the springs a decent amount and the pedal feels much more fluid, and it was already super smooth with the old beaters.
Even with the lighter beaters, I think the 9000 still has a lighter, snappier response. But the only 9000 I tried was with the Hardcore beater in it, and those are mostly foam and plastic so the Trick beaters are obviously going to weigh more, but also last longer. I noticed a tiny bit of aluminum rubbing of on the falam patch but that happens with any beater, plastic or felt.
Overall a very worthy investment for only $25 a beater, and best of all there aren't many people that have them so your pedal will totally stand out.