I just completed a transaction with chris007 in which I sent him my classic valve and some cash for his used lvl 10 retro valve. chris007 was in contact with me daily, sometimes multiple times, answering my questions. He shipped the retro valve to me on the same day that he received the classic valve from me. chris007 is easy to deal with, is prompt about returning emails, ships fast and provides a quality product. I would deal with him again if I get the chance.