I have been using this software since 2016 when it was first released by my previous employer as an in-house solution with no plans of going public or marketing outside its native India market (and even within that).
It's still used internally so far but we're looking forward towards getting our product out into other markets soon! There are some minor issues here & there which can be sorted easily if you've got good support team - otherwise try searching Google/StackOverflow questions about your problem specifically before raising any issue at all :) We use NHM primarily because data security became one major concern during internal audits done around 2017 where they wanted us not only show them what kind information stored securely inside their database etc.,but also how secure those databases were from external threats suchas hacking attemptsetc..