I really enjoyed our classes and I think I finally started to slowly get my German back. Although it is still not as good as before. 
I really enjoyed them as sometimes the exercises were relatively easy but sometimes they were harder than my level which pushed me to work harder which is good. I have recently purchased the second book you have recommended so I will try to work on it on my own until we can start again together. I believe B1 was too easy for me, however I need to work on my vocabulary, as this is what seems to be lacking as well. Maybe when we start again we could work on B2 for the moment.
It is very hard to say what I dislike because I really enjoyed the classes and I think they were useful. I appreciate the changes between speaking, exercises, etc. It was a very well taught class.