I think if you search via Google, on Google. you will get WAY more answers.
To avoid endless for sale responses
Type in "72v DBS review"
Not just 72v DBS
I doubt there are many responses here at all..

My two cents is that AQ found a new thing to work on. The idea is valid. The only question is when do you replace the battery? Can you?
Is the cable better than other brands?
AQ is produced in China, if you care. Kimber and Cardas made in USA, others ? I do not know.