That's nothing. I use cold black coffee and a sugar free redbull too, the 8.3oz ones. Perhaps consider adding a couple shots of espresso as well for the wee morning hours.
The thing is.... When I have a regular coffee I kind of sip at it until its gone.... When I have one of these fuckin shakes I pretty much chugg it and dude...... That shit REALLY gives me a swift kick in the ass.
Not nasty at all... I do it all the time... I mix some fresh coffee with my chocolate protein and throw in some ice cubes... its like an iced chocolate mocha... with real nutritional value... a great way to start the day!