Worth it to go Windspeaker's on Shen?

Hm... Never thought of this. TBH you shoul just try it out (maybe in a custom game) and if it makes a significant difference then just go Ardent- straight tank on Shen. (I don't think shield increasing items stack)

I would say no, since you burn the majority of the self-applies bonus on the channel of ult. Its basically just a boost to the ally's survivability if they know youre about to ult and then turn and burn.

If you want to go support Shen you're probably better off going for Stoneborn Pact -> or something like this