Great. A great example is the uber-demo ( Building Uber on Bubble? ) (not in app store, but quite good performance on mobile if you ask me.
If you dig through the forum`s search looking for references to play.google.com and itunes you will find links that people have posted previously.
Myself I`m also looking into how to build some high performance apps on bubble. Possibly using react-native or Ionic2. Maybe we could create some boilerplates that uses the bubble API and renders data from there.