Are PrimeBuy and Insight.com trusted for server parts (and any ATX PSUs with the fan at the back)?

Hi everyone. Basically the question; has anyone bought server parts off of PrimeBuy and Insight.com? Are they trustworthy?

I was looking for the Seasonic ES2, which has a fan at the back, to be used in a server, but the only places I could find it are at these two websites. They look fine to me but I thought I'd take the community's opinion on it (would be great if Seasonic sold it themselves but I don't think that's the case).

Thanks!