Originally Posted by
Koyote
If it's a "money no object build," you would not be asking this question.
Originally Posted by
PeteHski
Not true. I would buy the top tier groupset if there was a good reason. So I'm asking if there is a good technical reason why I should? Do they last longer, shift better, or are they more reliable, etc? My intuition is that they are just grossly over-priced for extremely marginal gains - or even losses if more fragile parts.
If you are questioning the cost of some marginal gains, it is not a "money no object build." Your decision is substantively identical to wondering if Ultegra is worth the additional cost compared to 105.
But okay, I'll play. Dura Ace comes with a three-year
warranty, other Shimano gear brings a two-year warranty. That suggests that D/A is more reliable, in addition to being lighter and built better. Whether that is worth the extra cost is a natural question, and nothing to deny. It's a valid question.