I've seen nothing but awful results from Ionic.

Admittingly, the constant changes and breaking stuff in Ionic 2 is getting a bit... tired. I know it's not at 'final' status yet, but still.

But we've been using it for a long time and have, in the main, had great results with it.

Xamarin has however come on leaps and bounds since out team started doing mobile development. And is free too... so I could see us switching to Xamarin to get native performance on apps that demand it.