Our gigabit radio had an SNMPv1 interface, but our customers were demanding more security. We evaluated several vendors to find a solution that had already been ported to our platform, worked out of the box, with available source code, and good support.
The only product that met our criteria was the SNMPv3 agent from DMH Software. We were immediately impressed with their support. Any time we had a problem, DMH support provided the information that led to a solution, usually within hours, sometimes even on a Sunday. On two separate occasions, I mentioned a feature that would help us, and would probably help other customers.
DMH support agreed, so they implemented those features, and provided the revised software to us. Using the DMH Software SNMPv3 Agent cut several months of development time from our schedule, compared to implementing it ourselves.