To aerate, or not to aerate, that is the question..
My readings have said it's a good idea to aerate if you have a large percentage of the batch as honey (#%? not sure) and if it's a particularly high starting OG (say, over 1.150 or more). So, why aerate? It makes the yeast happy, at first, and they need a good amount of oxygen during the first third of the fermentation process. I'm not sure how it coincides with step feeding though. Also, I can say it's a definite must (no pun intended) to aerate if you boiled your starting batch. Nothing drives off beneficial oxygen quicker than boiling.
So, I'm starting to see the benefits of aerating. I use a stainless steel stirring spoon, one of those big ones, with lots of tiny holes in it. Bought it at Wal-Mart, I think. But I really stir vigorously and keep it up for about 5 minutes. Others will say to stir multiple times a day at the beginning, so I tried that this go round with my cyser, and it fermented efficiently. I only aerated 4 times the first day, I believe it was. I would probably aerate more with a more traditional mead, probably daily, that contains mostly honey. I think it would help.