11 pretty big maps. Generally very well-constructed, but using a huge variety of textures per map (adds to eye fatigue after a while). Flow is usually pretty good, and textures are nicely aligned. Worth a look if you have a group of 4 or more.
13 maps. Eight are already here, as Vertigo Maps. The other 5 are worth the download... generally, interesting-looking maps. (Some look better than they play.) One of these will make you go blind if you play it too long...
A very nice multilevel map. Teleporters are color-coded, to help you figure out where you're going, and lights can make hallways safe or dangerous, depending on which side of the switch you're on...
A single-level solo map. Your goal is to collect three repair chips... two are pretty easy, one's a bit tricky. A nice little 5-D area in the middle...