I made a two-step stir-plate starter out of one vial of this. On the first step, I came back after about 24 hours and was dismayed to find no activity. I subsequently discovered that the lack of activity in the flask wasn't because there was anything wrong with the yeast — it was because the yeast ate everything in solution within 24 hours flat (!).
Pitched onto a batch of 1.065 ESB ale and hit FG of 1.02 within several days, so about 70% attenuation.
DIACETYL REST IS MANDATORY FOR THIS STRAIN (unless you want to make a butterscotch bitter). Cleaned up nicely after several days at 73º F (started off at 65º and slowly ramped up).
Although this does flocc like crazy without finings, I would still fine or cold condition for a long time to get clear beer. I bottle conditioned without fining/filtration/lagering and there's a ton of sediment in my bottles.