I've made ales with the Imperial B64 Napoleon, which is supposed to be similar to the Wyeast 3711.
It works out fantastic. The B64 is a monster. It ferments everything it finds. I'm about to transfer one from the fermenter to the keg today or tomorrow, after 3.5 weeks in the fermenter. It was made using the B64, the lightest pilsner I could find and exclusively German Polaris. I say go for it.
FYI, I also have good experience with the Imperial Yeast A20 Citrus with bright, hoppy ales.