They almost look like fireflies - about the same size.
Last September, I saw them and when I really looked, there were quite a few around, but I don't think the rest of my family really even noticed them very much. Like if you looked in certian places you could see them, but really I think they are over hypes here on the DIS.
If they weren't mentioned here, you may well not even notice them. It's not like they bite or inavde teh rooms or anything. They are even pretty good about staying out of the way, IMO.