I personally do not like teaching from powerpoint. I teach adults and sometimes they feel like it is story time. I usually go through the information first and demo whatever needs to be demoed, then I pop up the powerpoint to touch on key points rather than just read to them what they already have in their hands. I feel it also adds credibility to who I present myself as, the students also seem to feel like I am not just a warm body reading to them and that I really know what I am teaching.