Gigabyte Superb-Power 460W

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Hey,

I just wanna know your sights on this PSU and specs on it such as continuous power etc.
Is this power supply good - bad - great - suckage ?
I can get this for $20

 

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Oh and will it run my pc ?

 

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On my power supply it says :
"DC OUTPUT: +3.3V-30.0A
+5V-30.0A
+12V1-14.0A
+5Vsb-2.0A
-12V-0.8A
+12V2-15.0A
then
(+3.3V & +5V =152W Max)
what does this mean and is this good ? (for my system and in general)