I have an Android tablet (Samsung Tab Pro - the 12" beast). An experiment at replacing a laptop on some outings. I bought the A$140 Logitech keyboard / cover, which is good but not great, with some keys being a bit recalcitrant.
Some UI features are frustrating (example: alt-tab brings up the alt-tab switcher - you need to alt-tab twice to move to the most recent process, and toggling between two or three apps on the top of the stack is a common use case for me if I'm trying to do Real Work). An Android problem, I concede.
Given that context - how good is the keyboard, and how are you shipping keyboard + screen at less than a Logitech keyboard - I know, retail, scale, brand mark-up, two years later, etc ... but nonetheless?
Does the app smooth out some of the frustrations (f.e. the alt-tab problem) of working with Android with a keyboard & mouse as though it's a real grown-up DE? Is the app going to offer an increasingly customisable experience, or does it defer to the phone's native Android (and skins) features?
How does it feel - I know you're biased, but have you tried some phones that it just doesn't work on, and/or have some benchmarks or recommendations? I'm on an original Nexus 5 - which still performs adequately, but with low expectations on a phone interface - how well would it drive the Superbook?