The industries current focus on energy efficiency has made the need for a kilowatt class PSU much less prevalent than a few years back.  With current generation components even multi GPU systems can function with a 600W PSU which is why we are seeing so many arriving on the market.  This has created a challenge for PSU manufacturers as in order to receive an 80 PLUS certification the PSU must be over 80% efficient even at 10% power draw, over 90% for some of the higher ratings.  The Silverstone Strider Titanium 600W PSU came close to meeting those standards in [H]ard|OCP's tests, with some issues in their worst case scenario testing.  The PSU also runs about $140 which is somewhat higher than the competition.  The news is not all bad, check out their findings in full right here.

"SilverStone has been on a fairly successful ride with its Strider series of computer power supplies. These units tout excellent efficiency levels all while packing this into an unusually tiny footprint perfect for small form factor system builds. The ST60F-TI brings with it a solid build quality, near silent operation, all while being fully modular."

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