I'm considering upgrading one of my bikes to 10 speed Gevenalle control levers. That means I would have the opportunity to choose between traditional Shimano 10 speed road compatibility, or 10 speed Dyna-Sys, which is supposed to pull much more cable per shift, at the expense of needing a new RD. Losing the ability to use a road RD is a non-issue, as I've been running mountain 9-speed RDs on all my bikes for years to get the increased chain wrap.

I know that a longer cable pull helps when things get really muddy and messy, but what about ordinary road riding in fairly mild conditions (i.e. the occasional rainy ride and some grit during the winter)? I've always found Shimano 10 to be a bit fussy, at least when paired with a mountain RD. If Dyna-Sys 10 can shift as reliably as, say, my touring bike with 9 speed barcons, it would be worth the expense of upgrading the RD.