In light of the recent posts about a possible "upgrade" to a 2-clutch auto manual for future R8s...(from "Fastestlaps.com"): (note Fastest Laps typo: he MEANS "R"-Tronic in the quoted passage)
But R8 has appreciable disadvantage - S-tronic. This semi-automatic gearbox, as we saw on Driftbox diagram, needs approximately 0,3 second to change a gear. You feel it while driving - during the gearchange acceleration stops, and car is destabilized with powerful "kick" when clutch is re-engaged. Nor MB SLS neither 911 Turbo S with dual-clutch transmission have this negative side effect.
Being a 6MT driver, I don't have a dog in this fight (and yes, I know my shifts are slower than either auto-manual!). But I ran across this comment on the "Fastest Laps" website (great source for settling tap room disputes, btw, if you're not aware of it!). I thought it interesting that the writers considered the R8 "disadvanteged" by it's R-Tronic vis-a-vis the MB SLS and the 997 Turbo S, though it WAS clearly faster than the P-wagen in the chicane (are we surprised!).
Just fwiw, and don't argue with me, since I drive an MT, I'm obviously a sideline sitter on this issue. But suspicions along these lines, based on the basic design difference AND a kind of "clunky" experience with R-Tronic at the [email protected] are what made me lean toward the MT when I ordered. And, I have to admit, personally I will always prefer to clutch for myself!