Bottled over the weekend. 1728 took this Imperial Stout from 1.114 ---> 1.027. That's 76% attenuation and 11.4 ABV, which is a bit more than I expected, but not much more. Temp never got above 68°. Sample taste was promising enough, though admittedly a bit green. Hopefully I can get a fair bit of hardy yeast to give me enough carbonation. I'll check back next Christmas. 
I have run 1728 at 55 F with similar results. Amazing yeast.