Palo Alto Insight is now required by many a customer. Specially, with the creation of Virtual instances of Firewalls on Palo Alto monitoring is becoming a challenge. Individual VFW now have to be monitored with CPU, Mem consumption to be monitored individually. This will be the most basic requirement.
Advanced monitoring needed (but not restricted to) - connections through each virtual firewall, each virtual firewall throughput, and more
Network Insight for Palo Alto seems to be the only way.
Solarwinds Cisco is not the only vendor that deserves Network Insight.