Very, very nice :-)
One thing though; can you add a rounding option? Now it shows that one FAC is 0.0000063846 BTC.
I'm used to reading from right to left (1 FAC = x Satoshi) and that 63846 plays tricks with my mind

what about if we stick to 8 digits after the decimals separator, so FAC = 0.0000063846 BTC will look like FAC = 0.00000638 BTC ?