I suppose somebody must find this interface satisfactory, since the product category has existed so long. But for the most part, we found the human factors part to be too awkward. I realized then that I would not try this again unless I had a stylus+touchscreen device so I could have a more natural writing experience. Even then, I have experienced enough terrible stylus interfaces on point-of-sale equipment to realize that I need quite low latency before it feels natural rather than tortured to write on a screen.

But, for us to buy such a thing for many team members, knowing it will probably only see infrequent use, it would have to be at an entry-level Android phone price level, not at iPad price levels. However, I'd be concerned that something like a phone will not provide an appliance/peripheral-like experience. I want something that works consistently with any software over a matter of years/decades, not something tied heavily to a specific app and platform which may evaporate long before the hardware wears out.