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Using Ultegra instead of DA is not really because it's more robust. It's just good enough and offers great bang for buck.
When I was racing I could afford the best (Campy Record at the time) but you don't buy the best as race bikes have a shelf life and you fully expect to only use it for a few seasons at most and you know the chances of you destroying major parts of it are reasonably high or that wear and tear will take the rest.
Ultegra offers such a sweet spot on price and the difference to DA is so small and the money saved so important (no matter how much you earn, training and participating in events costs a lot in travel and accommodation if not gear), and spares are so common.
It's just a great balance.
I have DA Di2 on my Seven, but were I to be doing events like this I'd go Ultegra.
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Velocio
Is anyone on a really hi end derailleur setup?
Most of the bikes I've seen seem to be di2 ultegra, as it's more robust than DA.