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@Fretagain
Money, really.
The old Shimano is just that, old. It's very very slick, but now about 3 or 4 years old and hard to find new.
I have Ultegra 6700 on my Ribble. Very precise shifting, but not so "sewing machine" smooth as the old version of both (I've had both on my older bikes) Many reckon the hidden cables may increase resistance.
I got the SRAM front mech for £10.00 off ebay, very light use and not bad for their 2nd to top groupset parts. I wouls like to try a RIVAL equipped bike to see if it's worth upgrading, or just get some well proven 105 5700 when the time comes. Also toying with the idea of Di2 for the Ribble and moving the mechanical Ultegra across as well, but it depends upon funds next year.
What surprised me the most is that the MICROSHIFT front mech weighs 108.2g, just 6g more than the RIVAL.