No really, it's awesome. Yes, there are better cases out there, and if you're looking for an uberbad*** case you'll probably have to spend more money. However, the Antec 1200 V3 ranks up in the very top of cooling performance in almost any major case chart, so you do get what you pay for.
Honestly, it actually looks pretty cool, too. The blue case fans will light up a dark room, and you can turn off the big fan's light if it's too much. The case doesn't look like some freakish high-tech movie thing, which I actually like. It's still got more styling than 80% of the cases out there right now.
I've worked with many cases, and although this isn't the easiest case to work with, it's high up there. There's decent cable management room, and since the case is made of steel, you can jam cables into the "dark space" without the side panel bulging out. It's actually fairly roomy inside, too.
The only big problem this case has is the hard drive bay and front fan combos; in order to mount a fan in the front, you HAVE to have a hard drive bay behind it. This eats up space that could be used for a radiator, watercooling tank, or cable storage. It's a pretty obvious design flaw, but a minor one, and it didn't affect my opinion of the case overall.
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Here's a comparison of my case temperatures. My old case was an Antec 300 with four 120mm fans and one 140mm fan. My new case is (obviously) an Antec 1200, with six 120mm fans, and the big boy 200mm fan.
Setup: ASUS P67 Sabertooth Mobo, i7 2600K @ 4.2GHz under a Corsair H60, GTX470 @ 10% OC.
My old case's temperatures usually looked like this....
Fans: All fans set to max speed.
Idle CPU ranged from 38-42C, averaged 41C.
Gaming temps: CPU averaged 55C, GPU averaged 80*C. Really loud!
Max load: CPU ranged from 67-71C, averaged 69C with, BOTH CPU and GPU at max load.
My new Antec 1200 runs a bit like this...
Fans: All fans set to LOW speed.
Idle CPU ranges from 30-33C, averages 32C.
Gaming temps: CPU averages about 45C, GPU averages 75C (nice improvement, much quieter!).
Max load: CPU ranges from 59-65C, averages 62C, again with both CPU and GPU at max load.
The Corsair H60 was set up in push/pull/exhaust in both cases, so the temperature improvement was mostly due to the case.
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Final Pros and Cons:
+ Dust filters on front and side intake fans.
+ Lots of cooling power.
+ Big, roomy, with good cable storage.
+ Tons of room and circulation for large air CPU coolers.
+ Good for 2-3 video cards. Will fit very long cards (longer than GTX 580).
- Not ideal for a 120*240mm watercooler radiator; very tricky to mount
- Slightly difficult to mount regular watercooler.
- Fans tied to hard drive cages.