I stuck with the Toyota WS in my '11. I exchanged the fluid at 10,000 miles, accompanied with a new WIX transmission filter. I am still under warranty and chose to stick with the Toyota, which lists for $8.99, but I got for $6.89 by the dealer mistake. I'm thinking of going with Amsoil ATL which is their low viscosity ATF, however, I believe I read somewhere on a UOA that the Amsoil shown higher wear numbers in this tranmission. Please don't take this with 100% certainty, as I'm still tryingto locate that UOA.
EDIT: And nevermind, I now see that you are asking about the manual tranny. I got too BITOG excited. As Bill said, I too, have had good success with Amsoil GL-4 in the past in another application.