I just kegged it today, so I'll know for sure in a week. It tasted good flat and warm.
I screwed up my mash, and had to add some extract to it in primary to up the ABV.
As far as coffee...
I ground up half a pound of coffee, and soaked it overnight in a pint of vodka. I strained it, and added the liqour to the secondary.
The coffe flavor is not subtle at all. It's a little strong, but that may change with cold and carbonation.