Has anyone used or hear about them cause going to buy one soon probably.
They're good. as long as you buy power supplies with 80+ bronze, silver, gold or platinumcertification or at least 80% efficient w/ enough wattage to supply your needs. It's best to buy power supplies w/ at only one 12V rail. You can read tom's hardware guide to power supplies, they provide great information about the basics of power supplies.
Just remember that a power supply is the literal heart of the system, go cheap on this and you'll get pretty serious consequences. Never go cheap on power supplies, never.