Shimano 105 just seems to be a sweet spot unless you are an ultra-competitive professional who needs mechanically perfect shifts or to save a few grams here and there. Going up to Ultegra, Di2, Dura Ace, etc. increases costs but also seems to decrease long term durability!
It seems like electronic shifting and disc brakes are the future for competitive road bikes but I'd wait a few years for the technologies/designs to mature instead of being a guinea pig.
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