Hi,
sorry to invade in your conversation;-)
I've (amongst many others) a 10BII.
My experiences in short:
It looks what it is: cheap (only the price is too high).
The front finish only looks somewhat nice if you view it at a specific angle; from all other views you'll see the waves on the surface of the housing.
The keyboard legend colors could have been more ergonomic,
but that's a problem with *all* ACO calculators, the designers are simply color-blind (Reference: 32II,49G...)
The 10BII keys have tactile feedback,
more than you would want to.
It makes a loud 'knack' when you press a key,
and you have to press the key with heavy force.
The force needed to press a key is comparable to that needed on a brand new HP-34C,
which is very much compared to the HP-41's keys.
However, the 10BII occasionally looses key strokes,
and sometimes displays more digits than I have entered...
The best (joke) of it all:
The housing edges are surrounded by a rubber frame,
so the calc won't slide off your hands.
BUT:
The back case of the 10BII is nearly plane,
and the battery door looks some parts of a millimeter out the plane, and the very small (like hamster shit) rubber feet don't even have contact to the desk surface due to that outstanding batt door!
Conclusion: The calc is full of rubber, but vanishes if you try to use it on a desk. Good to have a litter can nearby.
The 10BII is the worst HP/ACO calc,
the 6S, 9g, 9s don't count here, because they're only
relabelled calcs from other brands.
Regards,
Raymond
(Sorry for my bad english, I'm just somewhat tired)