mcoomer

I need to replace my brifters and rather than put another set of 7800's on the bars I'd like to upgrade to 7900's. I've found a couple different versions of Shimano's compatibility chart and I'm a bit confused about whether my current crank will suit my needs. Currently, S-Works Tarmac SL2 is all DA 7800. My plan is to replace both brifters and the derailleurs. I'd like to keep my crank, cassette, chain, and brakes. Looking at the different charts I've found on the web it appears the crank, cassette, and chain combo will work but a couple of these charts say that shifting could be slower with the 7800 crank. The chart on the Shimano site doesn't show the 7800 crank as compatible.

Anybody running 7900 brifters and derailleurs with 7800 crank, cassette, chain, and brakes? Will this work well?

Thanks,
Mike