If you can afford it then why not, I can't so I won't.
Even though I have a bike with full DA 7900 it would still cost me in the region of £1.2 - £1.5k just to upgrade, it's not feasible, and for what I do not necessary.
That said, I would have the existing front and rear mechs and shifters to sell, all have only done around 300 miles so I'd get good money for them, put that towards Di2 and suddenly it could be possible...............
