i have 105 the previous version 5600 and i have ultegra 6700 and i have test ridden dura achee 7900.
i put ultegra marginally ahead of 105 both shift really nicely but ultegra has the edge. I put dura crappy last. it was rubbish and annoying and wouldn't shift smoothly.
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coasting, few quotes are worthy of him, and of those, even fewer printable in a family forum......quote 3alarmer
No @coasting, you should stay 100% as you are right now, don't change a thing....quote Heathpack