I like others was so excited when I purchased this.  I’ve been waiting for something like this for my vitamix.  I’m an old school vitamix owner starting with the 3600.  So I’ve been wait a long time.  
I love this adapter but I agree it could be improved.  The container is awkward and cumbersome to use.  If follow the instructions on the sequence of adding ingredients, I have no problem with the the consistency and no need to shake.  It’s still the best blender/food processor.