Antec are one of the good guys in PSU manufacturing. Almost anything the touch will be golden. As to that specific PSU, I don't have one and so cannot comment either way on it. But the question that's got to be asked is, what do you plan to power with it?
Its not the wattage req. that I'm concerned about, its just how good is this for a 550W unit.
It costs around $60, 80% efficiency, two 12v rails, combined wattage of 45A. It seems quite good to me.
Would like to get some insight from the experts here, as to where this PSU stands among the likes of Seasonic M12II/S12II 520w or the Antec HCG 520w etc...