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The only problem that the 6800 and 9000 FD's gave me has been occasionally shifting up and not having the derailer move at all.
They apparently tried for more leverage at the point where the chain is pushing the chain against the chainring, but less leverage (faster movement) as the cable pull initiates cage movement.
The result though was that it took much more cable force than before to initiate movement, which tends to fool me into thinking that the chain is already on the big chainring, since it feels like the derailer is hitting the hi-limit screw and doesn't want to move.
I've been riding with these early 11s front derailers for two-plus years now and still have this happen.
The 9100 is better in this regard but still can be very fiddly during the first 2 or 3 installs.
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