Here's what RealHardTech has to say about FSP
"FSP Group was established in 1993 and nowadays stands as the 5th largest power supply vendor in the world.
FSP / Fortron cooperates as OEM with many companies (Thermaltake, Antec, BeQuiet!, Amacrox, etc) to provide quality products"
The RAIDER units I found reviews for, the 450W reviewed by AnandTech and the 650W reviewed by HardwareSecrets both recieved high ratings. Since the 550W will be of the same design, I would come to the conclusion that the 550W would perform about the same.
http://www.anandtech.com/show/6013/350450w-roundup-11-cheap-psus/16
http://www.hardwaresecrets.com/article/FSP-Raider-650-W-Power-Supply-Review/1610/11
Hope it helps some