Just re-iterating my hope that you make the firmware split (fixed bootloader and reflashable main part), that way, when the payment protocol work is progressing it will be a smooth upgrade to have Trezors show names instead of addresses.
After long discussions with Stick, we decided that we'll offer also unlocked devices (bootloader + refreshable memory), so people will be able to update firmware.
Hooray!
You could also add the ability for the user to choose to (irreversably) blow out the programming fuse. If I were going to give one of these to my grandma I'd do that to it first.
100 is definitely NOT expensive!
Agreed.