I found myself suddenly "in" to pop bumper action. I found that a well tuned Firepower sometimes traps the ball for quite a while in the pop bumpers - walls to the upper left and upper right of the bumper area and of course and lanes immediately above.
I was actually disappointed by Whirlwind - it seems that with two banks of 3 bumpers, it ought to be great, but I found that I usually got just a few pops before it spat the ball out.
[picture from http://www.pinballrebel.com/game/pins/firepower/firepower_pinball.htm]
(see at 1'24")