components ?
 

would it be benificial to swap out my ultegra SL for a dura ace dérailleur 7800?
Also would you notice a difference if you just did the rear and not the front ...or is if better as as set front and rear?
I am assuming the ulegra sl shifters will work fine with the Dura Ace.

no, DA is primarily for light weight and bling.

It'll work fine. But whether you'd even notice a difference is dubious.

I'm a newb to road biking, but comparing it to mtn bikes, I would never switch out XT components for XTR, unless they were given to me or if I were seriously considering sponsorship.

Those components will not help your time. If you do end up getting them and notice an improvement, then it was all psychological, not mechanical.

If you were to upgrade anything, the RD is the place to start. As stated, you may or may not notice a difference, as Ultegra is good stuff. The FD has a pretty easy job; pushing the chain from chainring to chainring. You won't see the return in investment here.

no. Upgrading RD's only adds to marketability. (buyers look at the labeling on the RD.)

If the DA derailleur was free, then sure, why not. I would not pay MSRP for one if my Ultegra was working fine.

cool ..no swap then I will stick with the ultegra sl.
thanks for the info