It's weird to me, that if you're going to spend $6K USD on an amp that some small pin converter for $90 / pair is suddenly an issue. My decision process was I want the best quality all the way through. As well many things made in China are garbage. Remember all the cheap iPhone charges that lacked protection circuits and caused the phones to be damaged? I know this is much simpler so it's not exactly a good choice for comparison but it's first thing came to mind. I don't have test equip and IANA EE so I'm not qualified to say really if the cheap one is any worse than what Woo builds. I can say the WA adapter looks much better. Another thing I was thinking since I was new to tubes was: what if I some how have something blow up or catch on fire? I could say Hey I used WA components 100% through and through. That may be a little ridiculous but that was one of the reasons in my head.