[MFAFF]

Look.. it might not make YOU faster.. however it make my rides more enjoyable and hence faster to the next pub....as I am simply happy changing gears infallibly every time whenever I chose, something absent, in my limited experience of other brake lever activated indexed shifters (only Shimano Dura Ace and Campy.. not SRAM)

The real issue is when going from an older brake level shifter to another one is it really going to make much difference when other options are going to do so...in my experience.

Stealing from others' experience, which is far greater than mine, the difference in 'new' mech shifters is mainly one of 'character' as opposed to real capability, whilst the electric shifters do bring a step change in performance, certainly mentally if not physically as well.

I did a 300 mile day group ride a few months back and the feedback was that the electric shifters were generally giving people an easier time of it (in my MAMIL group), as gear selection was overall easier and faster, making them hills easier (!) to ride.. see Stage 1 of this year's tour for the route... while the racing whippets were happy with either, except for the two or three best riders who all had Di groups...who had all changed from their mech sets as the Di was a 'better' ride in their opinion.

My view is that the Di is a DSG gearbox...whilst the mech levers are a manual... friction shifts are a 915...so one is the past.. one is the future and one is.. well a choice.