[tomsem]

They need to add an option on MYK in the 'Device Synchronization' settings so that each device can have its own Collections.

And there should be a filter you can easily toggle when viewing a collection so that only on device items display. It is great that you can see all the collection members but it needs to be optional.

Collections with ONLY cloud items should only show up when you have Cloud filter set.

I gather that you cannot define a manual sort order in a given collection? You can do this with the iOS Kindle app, which is nice for book series, or for 'ranking' things. I wonder if the order set there is preserved when it syncs to other devices.

But I don't have a stake in this, I have never had any use for collections and probably won't start now, even if they manage to improve the UX a little. Mostly this is because they inevitably add clutter, navigation inefficiency, and overhead to maintain. And it does not scale to large libraries, does it? Ironic, that.