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I purchased an Antec 300 case, which came with 3 standard Antec tricool fans, and so i decided to fit the optional side and front spaces with Antec tricool blue led fans.
First things first, these fans are very attractive when they are on and glowing, the LEDs give off a good amount of light, and illuminate everything nearby.
These fans run fairly quietly, it seems most of the noise generated is by the rushing air rather than the fan itself. The movement of air is very good, and it can be felt by putting your hand near it.
The suction of two of these on the front of my computer is enough to hold a piece of paper in place, and this is behind 2 grills and an air filter.
I would recommend these fans as they are from a reputable brand, and are well made and perform well. They are fairly good value, and will also last a fair few thousand hours.