ivorygorgon
There is very little reason to use a triple any more with wider range cassettes and a mid cage length rear derailleur (to handle the extra chain needed for the larger rear cogs). Triples have so many overlapping gears that shifting can be a pain, and lugging the extra weight makes no sense.
I setup my commuter with a mid cage Ultregra SL rear derailleur but I'm still using an 11-28 with it. As the WiFli is compatible with RED and FORCE, it should also be compatible with Shimano, as RED and FORCE cassettes are. So it can be done with Shimano. It's really nothing new, mountain bikes have been using long cage derailleurs to provide the extra chain needed to wrap those larger cogs for decades. SRAM just put the pieces together as a road package first.
The chainline will also be improved over a triple (angle that chain deflects from rear cogs to front) so shifting will be smoother with less chance of the chain dropping off the chainrings. Q-factor was already mentioned here. Yes the gear jumps are greater at the lower end but I prefer living with that over shifting a triple any day.
Tzvia- rollin' slow...
Specialized Ruby Expert/mens Bontrager Inform RXL
Specialized SWorks Safire/mens Bontrager Inform RL
Giant Anthem-W XT-XTR/mens Bontrager Inform RXL
Fuji Newest 3 commuter/mens Bontrager Inform RL
Novara E.T.A commuter/mens Bontrager Inform RL