You mean exponential averages? I always meant to, but never did look up that word in the dictionary. They were invented by someone and have caught on by TA users, but I have compared them with the simple averages and although the lines are at different levels they do not do any different a job which, for me are crossovers and trends.
I went to back to simple averages because the Bollinger Band calculation is based on the SA and I wanted to keep everything the same. In a nutshell, I don't think that it matters much on the shorter timeframes, although it might on the longer ones.