The 105 stuff is great. Like, really great. But I don't like it.
I've never had a strong preference for campy vs. shimano vs. sram until I put campy centaur on my Bianchi a couple of years ago. The feel of the ergo brifters just have this natural, flowing fit. The 105 is angular, and slightly bulky at some points, but it just works so darn well. Shifting and braking feels like using an appliance. It does exactly what I want it to, but I'm relatively unexcited by it. Getting back on the campy equipped bike is always a joy. Maybe down the line, I'll swap things out on the CAADX, but that certainly isn't in the budget at the moment. But as I said, it works perfectly well as it is.