Campy's mouse ear is an inescapable consequence of the far simpler and more robust design of Ergos; it directly engages the shift barrel to release cable, unlike Shimano or SRAM. I always found using it from the drops a bit of a pain, particularly when the indexing springs got a bit tired and I'd often find myself making accidental multiple shifts. As for the lever QR, it's nowhere near as nifty as Shimano's caliper QRs, but it is neater and simpler.

I haven't ridden Doubletap, but I think STI has the best ergonomics; there's even another half of a shifting position: with the heels of your hands in the hooks of the hoods, you can reach your fingers down over the front and easily shift to a larger cog. Shifting to a smaller cog requires you to twist your hand towards the usual hoods position though.

All that notwithstanding, I much prefer Ergos. I hate the exposed cables, despite the easier housing replacement (they get in the way when I'm carrying something back from the shop), and the new STIs are even more complicated and sketchy. Ergos (at least the older ones) also look heaps better.

Doubletap, an unknown quantity. Can't wait to give em a shot...