I agree that the n900 KB was pretty much perfect, so something similar would be nice. The droid KB in the prototype OH is good enough in principle, only negative thing is that some keys (in my OH) require very hard presses, this means it's not possible to type really fast and almost blind like with the n900, because you have to constantly check if the keys registered. But it's still a very good, working prototype.
The thickness is a bit too much, I can carry it around when I have some kind of jacket on, but I don't like putting the Jolla with HWKB in my jeans back pocket, also the plastic is not exactly the most comfortable thing in the world. Some kind of thinner metal version sounds great. I don't have any problems with added weight, only bulk.

Looking forward to whatever new you will think of