Are you kidding me, what we like about Seasonic? DUH, it has unparalleled QUALITY and has VALUE (keeps every damn part juiced up, we need rock solid stability).
I like Seasonic because of the quality they put out. When shopping for power supplies, they are one of the very few elite that can be called a go to brand.
I bought a Seasonic X series because if the best PSUs use the Seasonic X platform, why not just go straight to the source? My X series is seriously quiet -- with a Sandy Bridge platform's power efficiency, you count on the fan not activating any time soon. The X series debuted in 2009, and it's only in the past few months that other platforms have come close to it in voltage regulation, efficiency, and good looks too. The first time I opened a X series box, I was really impressed with the presentation and velvet-like bag. It made me think that Seasonic was proud of what they were selling me. Some have lamented its packaging, but I think it's awesome and I hope that the tradition continues.
I now regard the power supply as the most under-rated system component. There's plenty of junk out there, but excellent power supplies are not all that common outside of enthusiast systems.