I was a bit skeptical about purchasing these fans as they got 3 stars right off the bat. But once you read the reviews carefully, you will find that all the reviews are about compatibility issues, all related to size. For those wondering, the fans are actually 200mm, meaning they're slightly larger, and their new 154mm size standard makes them compatible with the Phantom 530, 630, 820 and their upcoming NZXT cases. If your NZXT case was manufactured before 2013, the fans will not work. That being said, it seems like everyone has their issues. A quick look at the operating instructions for the PC case is enough to see whether the fan fits or not. Well, with that being said, the fans so far have been nothing short of amazing. I currently have 3 of these 200mm fans in my PC and everything works great. LOTS of balanced airflow flows through my rig without the loud wind buffering and weird random noises that some fans use to pull air when mounted on a PC case. You can tell these fans are built with quality in mind because they're durable, quiet, have a 3-pin sleeved wire (which many fans don't have, +1), and also sell for $15. You can't get anything better. For those who are still worried about compatibility, your best bet is to get the next best thing in this Cooler Master fan, which is pretty much universal and also sells for the same $15 price tag - http://www .amazon.com/Cooler-Master-MegaFlow-200-Computer/dp/B008G3OLRQ/ref=sr_1_1?ie=UTF8&qid=1402524461&sr=8-1&keywords=cooler+master+200mm
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