I wrote a longer post here but I’m making a digital drawing/painting app for iPad, using UIToolkit for the (WIP) UI:
I’m using a layer on top of UniRx to do data binding which has worked fairly well for me, but honestly UIToolkit needs better mobile support (I had to write my own drag/drop reordering lists and scroll acceleration, among other low level stuff) and better stock controls. Otherwise I do think UIToolkit is a big step up from UGUI, for my tastes. Please keep improving it!