I have two Dark Desire - one is own root and the other is grafted to multiflora.
The grafted Dark Desire is/was a little monster. I remember the first year I had to stand on a short ladder to obtain a photo. Was it worth it? Absolutely - I love it. The first year, I pruned it by a 1/4. The following year by a third it's height and last year by a half. I do recall one cane in particular that was a little wonky - that cane was pruned shorter than the other canes. Now it's height is more under control. The next time I prune, I will prune it a little more than half. It produces numerous beautiful flowers.
The own root was a slow grower. It's about 3 years old and about 2 1/2 feet tall presently. It produced 2 flowers last year.