Jenn is very good at imparting the information is a way that is both entertaining and educational. While I have been playing with this DNA site for quite a while, there was plenty for me to learn as well.
One takeaway that will be very helpful is the use of the site PiPL to help find out who some of the people who won't respond to you on Ancestry really are. You can put in their username and you may be able to find out who they actually are.
All in all, this was a very worthwhile workshop and well worth the additional cost.