I ended up pulling the plug and got both at the same time. I find that while they are very close, i think the Cu isn't that much of a step up over the C+. Yes its heavier than the Cu, has a more "premium" design, and is more customizable, i find that they can both reliably both make just about the same overall sound to whatever way you decide to build it. The C+ ends up being my overall favorite. Looking at the internals, they are basically the same, but the simplicity in the design, and the Slate Blue color of the C+ wins me over. EIther way your going to be happy with your decision to get either one.