Yeah - it can taste different. It also makes a big difference how you add it.... there are a variety of ways. My personal preferred method is to use whole beans, break/crush them very lightly.... so, they are basically broken in 2-3-4 pieces. Add them to the beer for 12-18 hours or so, and then get the beer off them and into serving keg. Generally, when I do this, I am doing it to a RIS. The RIS has fermented out and then been stored in a keg in the fridge to sit for a month or two. I put a screen on the dip tube of an empty keg, fill with star san, push the star san out with CO2, Pop the lid and throw the coffee in quick while leaving the gas on 2-3psi to reduce O2 getting in (1/2-1 ounce beans per gallon), seal it back up then I jump the RIS from the secondary keg onto the beans in the other keg. After 12-18 hours, I jump it back into serving keg and carbonate.