How about SilverStone ST50F?

I want to know your opinions, guys...

I have a SilverStone ST50F 500W. What do u think about this PSU?
Is it good enough? If it compared to the other PSU such as Corsair, Antec, Enlight, Thermaltake, at the same power, which one is the best?
Could u numbered them from the best to the least?
Thx a lot.
 
E6300
2x1GB PC5300 (dual channel)
GA 965P DS3
2x Seagate 160 GB
HIS X1650 Pro
ST50F 500W.

But i just bought a HIS HD 4850 iceQ 4 512 MB a few days ago.
Maybe i could install it next week...

I'm just curious about the quality of my PSU, that's all...