I have only built rigs with the NZXT Zero case
so far, so I can't comment on other cases but I can tell you what I think about this one at least.
* Looks very slick, especially when it is turned on with the blue power LEDs. I assembled 3 of these fellas at my office recently for work computers, and people kept coming by and commenting how they liked the look of it.
* Cold: 8 fans! (7x120mm, 1x80mm). The 4 fans on the side of the case supposedly help for SLI configurations
* Quiet: almost silent, you can only hear it if your room itself is dead quiet
* Full-tower case, lots of room for drives, etc.
* Surprisingly lightweight
* Easy to install floppy/DVD/hard drives, no screwdriver involved and also the 3.5" bays are rotated to face you so you don't have to twist your body trying to install hard drives.
* Removing the front panel involves basically pulling it really hard until it pops off. I feel like I'm breaking the case every time I do this.
* Plastic drive bay covers are a bit flimsy
* Screwless expansion card installation doesn't work very well IMHO, although thankfully you can use screws too, if you need to.
* Not very good at keeping dust out
* Although the case itself does not make much noise, I wouldn't recommend it for designing a "silent PC", because it doesn't do much to dampen noise from components like hard drives, etc.
* Some sharp edges so you might cut your fingers
* The side panel is easy to remove, but putting it back on is a bit annoying because it doesn't snap in or slide in, you kind of have to hold it tight while putting the screws in
Even though I listed a lot of cons, most of those are just minor things that are annoying when you're building your PC. Overall I like the case- it's cool, quiet, and looks sweet