Guys, I installed the Duelund CAST PIO Cu output caps last night and without going into too much detail yet I will say I think I like them better than V-Cap CuTF! The CuTF sound more vivid and super saturated by comparison whereas the CAST are smooooooth but every bit as detailed, possibly a tiny bit more. Imaging is so rock solid with so much depth and definition all all the way back through the sound stage. It's kind of like the CuTF are like an HDTV set up in an a store display where the picture is really bold and pretty, but the CAST are like a properly calibrated set that's natural and easy on the eyes (ears in this case). Not to say the CAST produce a subdued sound -- not at all. It's hard to explain. If you've ever heard the Berkeley Alpha DAC Series 2 vs. Series 1 it is kind of the same difference in sound to my ear.
I will let them burn in more and report back. Still like the CuTF very much and luckily I will get to enjoy both sets of caps with a second Havana on the way.