Something which I don't remember being touched on in this thread or elsewhere is that the front-facing camera is different in the First One to the later (in my case March) batches.

I assume the sensor is the same, but the lens is definitely different.

Other differences appear to be that SIM holder and battery have marginally better fit, and device creaks and groans less if you squeeze it (presumably better put together).

Also, does anyone have a later than March or April production date? Someone told me they had an April, but it was the first I'd heard of later than March, and wondering if they'd made an error.