I've contacted the Guys from GhostVolt and they have been attentive, reactive and open to suggestions for future improvements. I run a small accountancy gig and GhostVolt has helped us secure, organise and handle all our customer documents and keep within the ridiculous GDPR. My small team are now able to securely collaborate with customer documents right from a APP that looks a lot like explorer so not too much expense setting the team up. The only Con I can think of is Ghostvolt is not a cloud app so wont work for you if you're needing cloud access we we don't.