Mine is waiting till a few apps start to hit the App Store before she tries it. I think once a handful of the more polished apps start to make it out of their test flights, we’ll start to see another decent sized migration over here.
Fortunately I don’t think you’ll have to wait too long. I’ve been using Memmy in Test Flight since really early builds and it’s extremely impressive how mature and feature rich this app has gotten. The last update (which are usually daily) made themes customizable to the point where I basically have the app looking like how I had Apollo customized. It’s close to being fully reviewed and approved for the App Store.