Ultegra costs More. both shove the chain, from one sprocket to the other ..

is it worth the money ? IDK you got plenty of Dosh ? it's all relative.

Id be more thinking of the gear range , but its Flat down there so a choice is
Gear ratios.. want them left as is or change to something easier for you, a mere Mortal, to turn

Might not even have to Go Up to the 105 pricepoint to do the task.

now if showing your new bike off to your mates , has made the Jones's harder to keep up with,
then thats another thing..

New Sram road stuff is nice too..Apex, Rival or Red ?
I note they have a new Hydraulic master- Brifter, in the top, Red, group,
it can be set up with a Disc or a rim Brake at the slave end of the setup..

the new Hydraulic Rim Brake looks real interesting. http://www.sram.com/news-articles/why-hydraulic..