Austin on Own Roots?

How about Austin Roses. Are most of them on their own roots? Would you say they are more disease resistant then other modern roses?

At this point, the majority of Austins being grown are probably still sold as grafted plants. There is a growing trend of offering them on their own roots, and in time this form may even come to dominate. They seem from many reports to be about on par with other modern roses in terms of disease resistance - some being relatively healthy in most regions while others are apparently difficult to grow without regular fungicide applications in all but the most benign climates.