We have a generation model 2 Bronze efficiency (*). It may not be the "best of the best" (and again *), but it gives us, at a very competitive price, invoice PERFECT food, 5 YEAR WARRANTY, in practice COMPLETELY SILENT.
Seasonic invented the high-end power, while other manufacturers sell bombs or products that do not take the distance over two years. This supply is guaranteed for 5 years, which is unprecedented, and you can be sure that this model will never see his service. Everything is perfect in this, everything is well thought out, polished, perfectly connects to the end, the cables are just long enough for big boxes, all connectors are of good quality, etc.
Besides blades copies sold by competition, most will not take 3 years, this model there will easily hold 8 years, which is the average age of a Seasonic power supply (I still have S12-I ). Where competition will see their models or die fans make noise or efficiency down to the point that the PC will no longer start in nominal ...
With 520W, you can feed a configuration hassle "gamer" upscale and overclocked. It is not said that this is sufficient to SLI (to see what cards), but for the player, it is the certainty of never being short of watts even in several years with component wear . Count that the power consumed by PCs will diminish, while 520W today, it will still be sufficient in five years.
Seasonic, first of all, always envied, often imitated but never equaled. Especially in finishes and duration.
(*) Between Bronze and Gold, count a difference in energy consumption by 5%. This is not negligible, but for office mode consumption of 45W for a config gamer, you will consume 55W to 52W plug in bronze and gold. If you want my opinion, the difference will especially your type of computer hardware and it will be appropriate to act on consumption than on performance (recent GPU, variable speed processor, SSD, watches, etc).