I decided not to sell it. At first, I missed the bloom from the C220. After a couple of days, there was no turning back. I really like the X1. To me it is much more resolving than any tube preamps I have owned. I like the tubes better in the amp. After the X1 warmed up I was really happy and do not plan to sell anytime soon. The first day I posted it, a guy wanted it right away and offered me what I was asking. A dealer told me he would also give me what I paid for it, no questions. It got me thinking and now I know why.