Zone 4a, Wyoming. Sticky clay soil with a west facing garden.
I got Savannah two years ago from the Walmart clearance rack looking pretty much on death's door. It came back from the brink with a few blooms in a lovely color, but smothered in powdery mildew (it was the only rose in my garden with mildew even though it has a prime location and is less crowded than most roses in my garden). I wasn't thrilled.
It died back to the ground over the winter and I was sure it hadn't made it. But a while after the rest of the garden woke up, Savannah started to grow, and has reached a beautiful five feet tall with a steady supply of blooms all summer, not a ton at a time but never without blooms. The mildew hasn't made an appearance and the bush is a nice tidy shape, full, not gangly. So Savannah gets to stay in my garden and I don't really care if it dies back that much if it can recover the way it does. The blooms also last a long time in the vase, making Savannah a good option for gift bouquets.

'Royal Kate' has some dieback in my zone 4 garden but has come through several winters for me. She has a nice strawberry and raspberry fragrance with large blooms on long, straight stems.