Teas on their own roots?

Deb, in general how are Teas as own-root plants? I know this is pretty vague but as a group if you were to generalise how would you rate them on their own roots?

In general they are excellent on their own roots.

Recently, in Summer, I had a small cutting of Mme Antoine Marie grow calloused and roots very quickly under a part up turned bottle over a pot of sand. The plant I took the cutting from was itself a own root plant.
I have also got cuttings of Duchesses de Brabant, bush and climber, Souvenir D'Elise Vardon, Lady Hillington, Mrs Herbert Stevens climber, Monsuier Tiller and Sombreuil ( if it is still a tea rose ? ) to grow as ownroots during Winter.