I can't stand that most pops are clustered away and segmented from the rest of the game in almost every modern game. What's the point? I love when a game has a dangerous pop bumper that's a hazard, and is to be avoided. TZ is one of those games, but it's hard for me to come up with many others off the top of my head, so I'll be watching this closely.
TNA has a single pop, and it's exposed to make things dangerous. Even more interesting is that it's also a target! You actually have to AIM at the pop bumper to destroy a reactor. Very cool.
XM has a cluster that you shoot through, which is satisfying. It is mostly segmented, though one half of a bumper is exposed to the rest of the playfield, but usually doesn't cause much disturbance.
Flash has exposed bumpers, but they're far enough up the playfield that they aren't extremely difficult to recover from.