Well the Assault Sentry is really cool if you want to keep someone from getting to an alarm. Just set the Sentries up near somewhere that the stormies want to go, and watch the fun begin.
Want some real fun? Go play on ns_streets with a cloud of 50 seekers following you around. Pretty hilarious, as when a sniper starts shooting at ya, they act like they are a cloud of pissed off, white spherical bees!!! And they will go after whoever is shooting at ya!!! They will all fire about the same time, so you hear this mighty blast, and see 20-30 laser blasts coming from this cloud surrounding the hapless rodian. And then he will scream as he falls off of whatever high ledge he is on....
YAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAHHHHHH!!!!!!!!!! !! klunk!