From what I read about them, they sounded good to me for my home. This was right before I torn arm bicep, I had a G890 rootstock order and cancelled it. Forgot it it was maple hill or 39th parallel had them. Cummins nursery uses them alot, right where they were developed at cornell in ithaca, NY. It's either cummins or
https://www.mehrabyannursery.com/ has a good description and rootstock for sale.
Been tempted to post a thread about rootstocks we use. What you like / dislike and life expectation. Some of these rootstocks are bred to grow fast, but use up their lifespan some by doing that.
An apple orchard I visit and have squirrel hunted for them uses G890 rootstock in their pick you own section. Definitely visitng them in october. They have Liberty, Enteprise, and Redfield growing there. Wanted to try out what I am growing.