Dust proofing... its why the 250d IMO just murdered the mini itx form factor. A huge radiator, dust proofing, two ssd's in raid 0, two HD in raid 1, 780ti and you can play w/e. CM has a great price point and most of their products look great, if they were JUST a bit more up to date they would sell much more even if it means adding 10-15 more dollars to the price point. Similar to how I facepalmed when evga didnt make the power supply modular, the only horrible part of that case they only need one or two quick fixes to significantly improve.