I did my first couple sessions of playtesting this weekend for two compendium classes in my upcoming supplement: Binding World.
It went pretty well and I talk about the notes I took and changes I made in this post:
http://vindexus.net/2016/11/20/binding-world-update-3-playtesting-bloodbinder-and-medium/
Binding World site: http://bindingworld.vindexus.net
http://vindexus.net/2016/11/20/binding-world-update-3-playtesting-bloodbinder-and-medium/