Quoted from Whysnow:congo has some great pops. It can come out the top or the bottom super fast and is completely random. It can also assist for a volcanoe shot from the upper left flipper. Lastly they are perfectly placed for one of the best/most rewarding shots in pinball >> straight through the pops and up the volcanoe!!!
+1
Gotta say, out of my small collection Congo definately takes it.