ThinkComputers.org posted a review on the Sigma Shark 635W Power Supply

Sigma's new Shark line of power supply units combines a functional, stable supplier of required electricity with a stylish, finned, dual-fan cooling design, resulting in a silent but powerful device. It's also one of the most stable devices we've seen in a while. Combine that with a sub $100-price and it looks like we've got quite a nice unit on our hands. Read on for the review.

Sigma Shark 635W Power Supply Review