The new PC Power & Cooling Silencer Mk III 600 W is a very good unit, with efficiency between 81.4% and 86.3%, voltages closer to their nominal values than necessary (three percent voltage regulation), and extremely low noise and ripple levels. The cable configuration is fair for a 600 W unit.
This unit is being sold for USD 90, but if you live in the United States, you can get a USD 20 mail-in rebate, making its final price USD 70, which is an outstanding price for this power supply. The problem is that most users forget to send in the documentation to get the rebate, plus the time it takes (sometimes months) to get the rebate card back.
Also, at USD 90 it is still cheaper than its main competitors, which include the Corsair TX550M at USD 100 and the OCZ ZT Series 550 W, also at USD 100. It costs the same as the OCZ ZS Series 650 W, which doesn’t come with a modular cabling system but gives you an extra 50 W of power. And, if you are looking for a cheaper option in this power range, the Enermax NAXN 82+ 550 W at USD 75 is also a good option, although it doesn’t come with a modular cabling system.