I have used this yeast twice for Kolsch, and currently have a white IPA winding down that I held at 58 for a week and let rise to 66. I keep trying to get around to sampling it, but too many other chores right now. Very poor flocculation.
I am going to be giving it a go in a common in the mid 60's, another Kolsch, and a berliner soon.
I haven't used it over mid 60's, so I can't tell you how it works near 70.