My experience has been: The rootstock is on the smaller side, so not much growth goes into the graft, which means the first year has minimal growth. This works out nicely because it gives the rootstock a chance to catch up with the scion. The next year, the rootstock should be strong enough to handle any growth from the scion. This of course probably varies from rootstock to rootstock. You could always stake the tree and tie the rootstock and scion to the stake so nothing bad happens in a strong storm.
This isn’t something I would not recommend unless you absolutely have no other source of scionwood available. This is what I was sent, so I had no choice in the matter. That being said, I have been doing it for years and my trees are all fine. If it wasn’t freezing cold and pouring down rain, I’d go outside and photograph some older grafts that I did this too.