I like how easy it was to set up, configure with our existing infrastructure (VMware vSphere).
The UI for managing backups can be improved in some areas but overall we are very happy so far using this product from unitrends as backup solution of VMware VMs running at my customer site. Currently no issues reported by us or customers regarding performance/reliability etc., however would love if they could provide more granular reporting capabilities via API's also - which will enable better monitoring & alerting setup within their cloud offering too :) Would highly recommend considering them when looking into vm-backup solutions available today since you get enterprise class features backed out through support contracts without having much upfront costs involved compared other products such pricing wise. Backups / Replication between different data centers across geographies has been simplified tremendously now thru effective VM replication feature provided here.