Funny you should mention you want a 600t.. As that's the case I am using now, and I don't like it. Its aesthetically an awesome box. However it has some flaws.. Only one USB 3.0 and you have to use a passthrough cable because the 600T was never equipped with a USB 3.0 20 pin header. The airflow is pretty bad. It only has one 200mm intake in the front, and it can't be replaced for very many other fans because only the corsair ones (and some bitfenix fans) have the clearance. I am also really not a fan of the fan controller. It works, but I prefer fan controllers that react in real time to varying temperatures. It seems silly that I should have to be constantly changing the dial to account for a computer that sounds like its ready to fly when I am simply browsing the internet. The latches on the doors are a bit sticky, and despite my best efforts and what I consider to be good cable management behind the motherboard tray I was unable to get the cables close enough to the tray so that the side door would not be pushed open slightly in certain corners.
And my last complaint is rather silly. The HDD LED is insanely bright. It's not soft at all like you would expect, rather it reminds me of my streamlights..
The only complaint above (well two) I think can be overlooked is the HDD LED, and the fan controller. Other than that the case has some flaws. Which actually I could have overlooked but the case is simply too large for my small room. I didn't fully understand how big it was until I got it and set it down beside my phantom. I know the 600T is a mid tower, but I swear it should be a full tower..