The Mindfulness Based Stress Reduction course is one of the best investments I've made and has provided me tools for life. I like the balance between content and teaching style with lots of practice involved, which I haven't seen on other mindfulness courses which are mainly theory based. It's good to have small classes so we can have deeper discussions.
Advanced Mindfulness is a great stepping stone to take your mindfulness to the next level. With already having the basics from the MBSR course, I found Advanced Mindfulness enhanced my practice that bit further and it is nice to get to know the regulars. Nel is such a fantastic teacher and provides lots of kindness and understanding.