I put superbands on 9 of my pins (all eras), and have been using them for about a week. I'll break this down by attribute:
POWER INCREASE. I assume is due to the higher density of the urethane. This change is a positive for my 2 EMs. The ball is too fast on IM and MET, though. I keep bricking the first graveyard drop target. Making the ramps is almost too easy. Verdict: fine for EM and early SS, bad for DMDs.
ROLLING RESISTANCE. This one is the dealbreaker for me. The ball slows down a lot more while rolling across the flipper, which is why drop catches are so much easier. But if I try to do a rolling pass, the ball loses momentum and doesn't make it over to the other flipper. Maybe a few hundred plays will change this, but I doubt it.
BOUNCE. I don't use bounce passes much, but I do use tip passes. Since the ball bounces off the tip much less, I'm seeing a lot of tip passes fail. Sucks. And by the way, DO NOT use the urethane post rubbers near lane guides or especially on the post between the flippers (if the game has one). It sucks so bad to have the ball hit that post directly, and then watch it weakly fall off to the side.
APPEARANCE. Super-bands look awesome, and I love the color variety. I wish there were some UV-reactive colors.
CONSISTENCY. Super-bands play the same no matter what color I use. That's good.
I plan to leave the super-bands on for league play this month, so I can see what others think. But I will probably be putting them up for sale soon.