My apologies - I reported 'Kordes Robusta' as a missing plant, but now realise it is listed as 'Robusta'. As it is marketed in (at least) UK and New Zealand as 'Kordes Robusta', perhaps this could be added as a synonym?

I've planted five of these in a flower bed under these conditions:

-Québec city, Qc, Canada, in zone 4 with hot, humid summers and cold, humid, snowy winters
-Full sun and average exposure to wind
-Planted in a well-drained, compost-rich soil with no supplemental fertilizer
-No winter protection whatsoever, except for about 3 feet of snow
-No pruning except for winter dieback or damaged canes
-No pesticides of any sort
-Planted with three feet apart from each other

Here are my results:

-Extremely vigorous plants. Yearly growth averaged 6 feet vertically; I've had one 10-foot high cane about an inch thick one time. 8-foot high canes were common. Canes are stiff and extremely thorny, one of the spiniest roses I've had.
-Laterally, the bushes have filled up nicely. Not uniform enough to make a formal hedge but enough to make a more natural-looking hedge
-I've had very little winter dieback; a few cane tips here and there and some physical damage. Come late spring, any damage was completely hidden if not pruned off.
-Foliage was dark, lush and great looking. Imagine a rugosa texture, but dark green with red accents. This alone would make it a great-looking plant even if it never bloomed.
-Very susceptible to black spot; my plants could be completely defoliated by the end of summer. I've also had some problems with caterpillars chewing them up. No sign of mildew, but I've never had any in my garden yet. I have taken them out of my garden after 4 years because of the black spot problem.
-Gorgeous, vibrant, large flowers produced in abundance from late june to late august in my garden. Combined with the plant's size, it makes for an attention-grabbing plant. I've never had any fragrance to speak of.
-Grafted and no visible suckers in 4 years. 2 years after taking them out, I have a small sucker left that I had apparently missed.
-Never needed any watering or extra attention.

All in all, a first-rate plant if black spot is not an issue in your area. I have not sprayed it since A) I try not to spray and B) having a rugosa-like foliage, I feared I would damage it by spraying. But if you're willing to spray, the whole black spot issue could become moot. If it were not for this problem, I would never have taken them out of my garden as they were some of my favourite roses. Just be sure to leave them some room to grow, these are definitely not delicate bushes.